Family therapy is likely the primary intervention choice for all of the following issues, EXCEPT:

Family therapy is typically an effective intervention for issues that involve relational dynamics and communication patterns, as many problems are influenced by family interactions. In the context of anxiety disorders, substance abuse, and marital conflict, family therapy can be particularly beneficial.

When addressing anxiety disorders, involving the family can help to reduce stress within the household, and family members can be educated on how to support the individual dealing with anxiety. Substance abuse often has familial roots, and family therapy can assist in addressing communication barriers and fostering healthier family environments that discourage substance misuse. Similarly, marital conflict often directly involves both partners and can be effectively addressed through family-level interventions that promote understanding and communication between spouses.

Borderline personality issues, however, often require a different approach. Individuals with borderline personality disorder (BPD) may struggle with emotional regulation, identity issues, and interpersonal relationships in such a complex manner that traditional family therapy might not yield the best outcomes. Treatment for BPD often emphasizes individual therapy modalities, like Dialectical Behavior Therapy (DBT), which focuses specifically on the individual's emotional and cognitive needs. Therefore, while family dynamics can play a role in BPD, family therapy is not the primary intervention choice for addressing the intricacies of this disorder.