Justin Jones, Ph.D. | Clinical & Forensic Psychologist | April 2026

In high‑conflict custody litigation, the court is often presented with a diagnostic label – “Borderline Personality Disorder,” “PTSD,” “Major Depressive Disorder.” But a diagnosis alone tells very little about a parent’s actual capacity to care for a child.

What truly matters – and what is often missed – is the parent’s personality structure: how they organize their identity, regulate emotions, use psychological defenses, and relate to others. This structural perspective is essential for accurate forensic evaluation and for helping the court make a best‑interest determination.

What is personality structure?

Personality structure refers to the stable, underlying organization of self and others that shapes a person’s thoughts, feelings, and behaviors. It is best understood through dimensional models such as the DSM‑5‑TR Alternative Model for Personality Disorders (AMPD) and the Psychodynamic Diagnostic Manual (PDM‑2).

Key domains include:

• Identity organization: Does the parent have a coherent, stable sense of self? Or do they experience chronic emptiness, role confusion, or contradictory self‑states?
• Defensive patterns: Do they rely on mature defenses (humor, sublimation) or primitive defenses (splitting, projection, denial) – especially under stress?
• Mentalization capacity: Can they understand their own mental states and those of the child and the other parent? Or do they project their own emotions onto others?
• Emotional regulation: How do they respond to frustration, rejection, or perceived criticism during litigation?

Why a diagnostic label is not enough

A parent with Borderline Personality Disorder can be a capable, loving parent – if they have good identity integration and mentalization capacity. Conversely, a parent with no formal diagnosis can be dangerous – if they use splitting and projection that leads to parental alienation.

In my forensic practice, I have seen evaluations that simply list DSM criteria, leaving the court with no understanding of why the parent acts the way they do. A structural evaluation answers:

• Why does this parent oscillate between idealizing and devaluing the other parent?
• Why do they sabotage visitation when things seem stable?
• What kind of intervention – therapy, supervised visitation, parenting classes – would actually help?

What a structural forensic evaluation includes

• Multi‑method assessment: clinical and forensic interviews, collateral record review, psychological testing when indicated, and symptom validity assessment.
• Differential diagnosis: distinguishing personality pathology from trauma‑related disorders, mood disorders, or situational reactions.
• Clear formulation of parenting capacity: not just “has a disorder,” but a detailed description of functional strengths and vulnerabilities.
• Specific recommendations: tailored to the family’s needs and the legal context.

Conclusion

If you handle family law cases, you want an expert who looks at personality organization – not just DSM codes. A structural evaluation provides the court with a clear, evidence‑based understanding of parenting capacity, risk of conflict escalation, and what kind of intervention might help.