Okay, now you have talked about Narcissistic personality disorder how about Borderline Personality Disorder? What are your recommendations in co-parenting with someone who has this disorder? Both my ss's bm has this disorder and my dd's bf has this disorder. My husband and I have sole custody of both children which really helps. We have learned to set boundaries as hard as this can be because they want to break any boundary you have set. And we do all communication in writing with ss's bm so we can prove what was actually said. Any other advice?