What to do if i have a close relative with borderline personality disorder, what should i do?

Professional: Only help this person by obtaining professional treatment. Never attempt to do it yourself or it will destroy your life.

Borderline : The hardest thing to maintain with borderline personality disorder are interpersonal boundaries. Boundary violations often occur with people struggling with this disorder and whoever your relative is, you're going to have to work on those boundary issues first and foremost, most notably in terms of safeguarding against being emotionally invaded or manipulated by that person.