In family law, experienced lawyers prevent and fix non-joinder by using a focused, empathetic, and procedural checklist: they start with a full stakeholder map (spouse(s), children, step-parents, guardians, trustees, custody respondents, insurers or family-business co-owners) and verify identities and legal capacities early; draft pleadings that name all potential claimants and include alternate/contingent relief (so orders remain effective if parties are later added); serve process promptly and follow up on any returned service; if an omission is caught later, move immediately to amend pleadings and implead the missing person (or seek the court’s permission to do so), propose interim protective measures (temporary custody, injunctions or protective orders) to avoid prejudice, and use mediation or voluntary joinder where appropriate to resolve inclusion issues without delay; throughout, they document diligence, keep communication open with the court and opposing counsel, and consult specialists (guardianship, juvenile court, or probate counsel) when capacity, minor-interest, or succession issues are involved — a blend of early investigation, precise pleading, swift remedial steps, and cooperative problem-solving minimizes delays and preserves the family’s substantive interests.