When a person’s pattern of thinking, reacting and relating becomes rigid, extreme and chronically destabilising, the impact rarely stays contained within the individual. It spills outward. In this way, personality disorders can impact parenting, shaping the emotional climate of a household, and influencing how children attach and how partners cope. In this fourth instalment of our online series about different mental health conditions, how they affect children and parents, and their legal ramifications, we hear the views of a psychologist and a family and divorce lawyer.
DR QURATULAIN ZAIDI is a British- and HK-registered clinical psychologist who works with individuals, couples and families in a private practice in Central.
What exactly is a personality disorder?
We all know someone who is intense, suspicious, controlling, emotionally volatile or chronically avoidant. Different personality traits are part of what makes us human, and they exist on a spectrum.
However, there is a point – not always a clear and simple one – where enduring patterns of thinking, feeling and relating begin to impair functioning and damage relationships over time. That’s where personality disorder enters the conversation.
Personality disorders are complex and not easily defined, which makes living with them and diagnosing them challenging. In public conversation, particularly social media, terms relating to these disorders have unfortunately become common language, often weaponised, stripped of nuance and used as shorthand insults.
According to the American Psychiatric Association (APA), “Personality disorders are a group of conditions marked by enduring patterns of thinking, perceiving and relating that disrupt long-term functioning and are not confined to isolated episodes.”
The DSM‑5 (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition) identifies ten personality disorders, grouped into three clusters:
- Cluster A includes the more “odd or eccentric” presentations; these are paranoid, schizoid and schizotypal personality disorders.
- Cluster B includes the dramatic and emotionally volatile disorders, namely antisocial, borderline, histrionic and narcissistic.
- Cluster C (the anxious and fearful patterns) includes avoidant, dependent and obsessive-compulsive personality disorders.
Where does Borderline Personality Disorder fit in?
Borderline Personality Disorder (BPD) is one of the 10 personality disorders within Cluster B; it’s not synonymous with personality disorder as a whole, but has historically been described as existing on the “borderline” between neurosis and psychosis. At its core, BPD involves profound instability in a person’s identity, mood, relationships and self‑image. Around one to two percent of the adult population are thought to be affected, though it’s frequently confused with bipolar disorder, ADHD, PTSD or depression because of overlapping symptoms.
Often discussed in the same breath as BPD is Narcissistic Personality Disorder (NPD), another Cluster B diagnosis that tends to surface during relational breakdowns. NPD is characterised by a pervasive pattern of grandiosity, a deep need for admiration and validation, and difficulty with empathy. Individuals may present as confident, articulate or even charismatic. However, beneath this exterior there is often a fragile self‑esteem that is acutely sensitive to criticism.
BPD and NPD can both create environments that are highly volatile and cause chronic relational strain.
How can personality disorders disrupt households?
Despite their profound impact, personality disorders rarely appear in tidy boxes to be ticked on the list from DSM-5. These characteristics are challenging; they overlap and evolve within relationships. However, at their core is a common thread: difficulty maintaining healthy, reciprocal relational functioning. Over time, these enduring patterns affect the individual but also define the emotional atmosphere at home.
- In Cluster A patterns, there may be persistent distrust that turns everyday interactions into interrogations, with benign comments interpreted as threats or betrayals.
- Cluster B patterns may include emotional volatility where relationships swing between intensity and rupture. Minor disagreements escalate quickly. Criticism is experienced as attack. Apologies are followed by renewed conflict.
- In Cluster C patterns, often rooted in anxiety, there may be chronic reassurance‑seeking, hypersensitivity to rejection or rigid control over routines and expectations. The atmosphere may feel tense not because of volatility but because of constriction and lack of space for the others.
What are some ramifications of parenting under emotional instability?
Parenting requires consistency, emotional regulation and enormous deposits of patience. When a parent struggles with entrenched personality patterns, these capacities are often compromised.
In milder presentations, children may experience inconsistency in the form of a parent who is warm one day and withdrawn the next. They may become highly attuned to mood shifts, adjusting their own behaviour to maintain peace or avoid conflict.
In moderate cases, children may be exposed to frequent arguments or be drawn into adult conflicts. This can lead to role reversal, where the child takes on the responsibility for the parents’ emotions and doesn’t feel they have the right to express their own emotions.
In more severe cases, children may witness self‑harm, suicide attempts or psychiatric hospitalisations. Exposure to intense anger, threats of abandonment or chaotic relational dynamics can create a deeply unsafe psychological environment. Children in these systems often develop hypervigilance; they scan constantly for emotional danger. Some become excessively compliant; others externalise distress through aggression or withdrawal. Many carry a quiet but heavy sense of responsibility for a parent’s wellbeing.
It’s important to state this clearly: children do not cause personality disorders, and they are certainly not responsible for stabilising an emotionally dysregulated adult.
What are the treatment options?
Personality disorders have historically been considered difficult to treat, partly because individuals may lack insight into how their behaviour affects others. Many seek help only when relationships collapse or when depression or anxiety become overwhelming.
However, effective treatments do exist. For example, there is strong empirical support for Dialectical Behaviour Therapy (DBT), which focuses on emotional regulation, distress tolerance, interpersonal effectiveness and mindfulness skills. Other therapeutic approaches such as CBT, EMDR and Schema Therapy have also shown promising results. Medication can be valuable in managing associated symptoms like mood instability, anxiety or depression.
Support for the other parent is also important, because living with someone whose emotional world feels volatile or rigid can lead to chronic stress, self‑doubt and emotional exhaustion. Individual therapy, psychoeducation and structured support can help restore clarity and resilience. The goal is not to “fix” the other person but to strengthen their stability and capacity to parent effectively within a challenging dynamic.
What support is available for children?
Children in these environments also fall victim to the volatility and unpredictability; they often remain silent out of loyalty, sense of responsibility, guilt, fear or confusion.
Encouraging access to safe adults is crucial as a support system for the children. A teacher, school counsellor, extended family member, family doctor or experienced therapist can provide help and perspective. Early intervention significantly reduces long-term impact. Research consistently shows that even one stable, emotionally regulated adult can buffer children against adverse developmental outcomes.
A final word?
Personality disorders are estimated to affect around 10 percent of the population, though this figure depends heavily on how broadly we define impairment. These are not simply “difficult personalities”. They represent enduring patterns that impair functioning and strain relationships over time.
At the same time, diagnosis carries subjectivity. Cultural context, clinician interpretation and relational dynamics all influence how labels are applied. Not every high-conflict relationship involves a personality disorder, and not every individual with a diagnosis is incapable of growth.
What matters most is impact. If a home environment feels chronically unstable, emotionally unsafe or unpredictable, that deserves attention and support regardless of terminology.
And for families navigating this quietly, often behind closed doors, it’s important to know that there is support and treatment available – and children deserve stability and safety above all else.
Dr Quratulain Zaidi
WhatsApp +852 9700 2786 | mindnlife.com
VANESSA DUFF is a specialist family/divorce lawyer and Partner at Charles Russell Speechlys LLP.
How do the courts view claims of personality disorders affecting a relationship and children?
There is no presumption that a parent is unfit to care for a child simply because a personality disorder has been alleged or even diagnosed. The court’s paramount concern is always the welfare of the child. That means it focuses on the actual impact of a parent’s behaviour or condition on the child, rather than on labels or diagnoses alone.
That said, the courts do take such conditions seriously where there is credible evidence. Personality disorders can affect emotional regulation, impulse control and the consistency of care – all of which are directly relevant to a parent’s capacity to meet a child’s needs. They can also result in a child witnessing self-harm or other distressing events in the home.
Where a parent is alleged to display traits consistent with a personality disorder, the court will want to understand what specific behaviours are being described, how frequent and how severe they are, and – critically – what impact they are having on the child.
In high-conflict cases, it’s not uncommon for one parent to raise concerns about the other’s personality or mental health as part of a broader narrative. Judges are well aware that divorce proceedings can bring out the worst in people, and that allegations of personality disorder can sometimes reflect the dynamics of a difficult relationship breakdown rather than a genuine clinical concern. The court will look for consistency, corroboration and concrete evidence, rather than simply accepting at face value the characterisation of a former partner as unstable, controlling or narcissistic.
Is a formal diagnosis necessary, or is the focus on behaviour affecting the child?
This is one of the most important questions in this area, and the answer is that a formal diagnosis is neither always required nor always determinative. The Family Court is not a clinical body and does not make psychiatric diagnoses. What it assesses is behaviour and parenting capacity, based on the evidence before it.
A parent does not need to have a confirmed diagnosis of a personality disorder for the court to take their behaviour into account. If the evidence demonstrates that a parent acts in ways that are unpredictable, emotionally volatile or harmful to the child – whether or not a professional has assigned a diagnostic label to those behaviours – the court can and will factor that into decisions about care and control, and access.
Conversely, a confirmed diagnosis does not automatically lead to adverse consequences. A parent who has been diagnosed with BPD but who is managing their condition effectively, with appropriate support and stable functioning, will not be treated as unfit simply by virtue of that diagnosis.
Where a diagnosis is relevant – for example, because a party’s condition is severe or disputed – the court will typically appoint a clinical psychologist or psychiatrist to carry out a formal psychological evaluation. Parties may also commission their own independent psychological assessments, which can be particularly useful where unfounded allegations have been made.
Judges are cognisant of the importance of both parents playing an active and meaningful role in their children’s lives, provided it is safe to do so. A formal diagnosis can therefore assist the court in understanding what steps a parent needs to take to ensure that their condition is appropriately managed. The types of medication and therapy will vary from case to case, and the judge will often seek expert advice – frequently from a psychiatrist – on what treatment is needed.
How important is evidence and documentation of behaviour in proceedings?
It is essential. Without it, allegations of personality disorder or problematic behaviour remain precisely that – allegations. General assertions that a co-parent has a personality disorder will carry limited weight unless they are supported by specific, documented incidents or professional expert opinion.
The types of evidence that tend to be most persuasive include medical records, psychiatric notes, police records, as well as contemporaneous written records – messages, emails, voice recordings and diary entries made at the time of incidents rather than reconstructed later. These carry significant weight because they reflect what was actually happening at the time, without the distortions of hindsight or adversarial litigation. School or nursery records are also valuable where teachers have observed behavioural changes in a child or concerning interactions at pick-up or drop-off.
The way a parent conducts themselves within any court proceeding can itself give rise to concerns. For example, a parent experiencing paranoid ideation or psychotic symptoms may harbour such distrust of their former partner, or hold such distorted perceptions of ordinary situations, that they engage in excessive and intrusive questioning of their child – particularly after the child has spent time with the other parent. They may also develop irrational fears that lead them to become overprotective or, in extreme cases, to abduct the child to another jurisdiction.
Witness testimony from third parties – domestic helpers, family members, childcare providers or close friends who have observed specific incidents – can also carry considerable weight, provided those witnesses are credible and consistent. In some cases, the social welfare officer’s report will itself document observed behaviours or interactions that support or undermine the allegations made.
Parents who are concerned about a co-parent’s behaviour should maintain careful, factual records – not a running emotional commentary, but a concise log of specific incidents: what happened, when it occurred, who was present and how the child responded. This kind of documentation serves two important purposes. First, it provides an evidential foundation should court proceedings become necessary. Second, it helps both the client and ultimately the court to distinguish between a pattern of genuinely concerning behaviour and isolated incidents that may reflect the stress of a difficult separation rather than a persistent problem.
What are the legal ramifications where a parent has a personality disorder?
The legal implications depend heavily on the specific presentation and severity of the condition, as well as the professional support already in place. No two cases are the same.
Where there is evidence of emotional volatility directly affecting the child – for example, extreme reactions that leave a child frightened, confused or distressed – the court will consider imposing supervised care arrangements. Supervised access involves a third party being present during the parent’s time with the child, or contact taking place at a designated contact centre. This is appropriate where the risk to the child is assessed as real, but the importance of maintaining the parent-child relationship is also recognised.
Where there is evidence of parental alienation – which can sometimes be associated with certain personality presentations, including rigid thinking, difficulty distinguishing the child’s needs from one’s own, or a tendency to draw the child into the adult conflict – the court will treat this very seriously. Such behaviour can sometimes manifest as a child seeking to protect a parent by doing or saying what they believe that parent wants to see or hear.
Parental alienation, where it is found to have occurred, is treated as a form of emotional harm to the child, and the court has the power to adjust care arrangements significantly in response. In certain circumstances, a complete change of care and control may follow, with the child being removed from the care of the alienating parent and placed in the other parent’s primary care. It is often essential for a child to receive therapeutic support alongside such a significant change in their living arrangements.
In the most severe cases – where the court finds that a parent’s condition is causing significant physical or psychological harm to the child – it may award sole custody and sole care and control to the other parent, with a complete suspension of access or very specific conditions attached to any contact. This outcome is uncommon and the threshold is high, but it can and does arise in the most extreme cases.
How can ongoing treatment and outcomes affect legal decisions?
The court places significant weight on a parent’s engagement with treatment. It is not the existence of a condition that determines the outcome; it is the parent’s response to it. A parent who acknowledges that they need support, who has engaged proactively with a therapist or psychiatrist, and who can demonstrate measurable progress – improved emotional regulation, more stable functioning, consistent and appropriate care of the child – is in a materially stronger position than one who resists help or denies any difficulty.
Evidence of treatment engagement is therefore important and should be documented proactively. This might include a report from a treating psychologist or psychiatrist confirming attendance, the therapeutic modality being used (for example, dialectical behaviour therapy), current functioning and progress, medication compliance where relevant, and the clinician’s view on the parent’s capacity to care for the child. Courts are reassured by specificity – a comprehensive, detailed report from a treating professional carries considerably more weight than a generic letter simply confirming attendance at therapy sessions.
Court orders – including care arrangements and any conditions attached to access – can be varied as circumstances change. If a parent’s condition improves and this is supported by clear evidence, it may be appropriate to apply to the court to vary existing orders: for example, to move from supervised to unsupervised access, or to increase the time the child spends with that parent. Equally, if a parent’s condition deteriorates or they disengage from treatment, the other parent may have grounds to return to court to seek further protection for the child.
The message I give to clients on both sides of this dynamic is the same: these cases are not static. The court retains jurisdiction over child-related matters until they turn 18, and orders made today reflect the circumstances of today. What matters is the trajectory – and a parent who is genuinely investing in their own recovery, and who can demonstrate that investment, will always be in a stronger position before the court than one who is not.
Vanessa Duff
+852 2531 3438 | charlesrussellspeechlys.com
This article covering the challenges around personality disorders and parenting, including the legal ramifications in custody matters, is the final instalment of a four-part online series. See the first instalment here, the second here, and the third here. You can also find more pieces like this in our Wellness section.
