I don't think Borderline Personality Disorder (BPD) is an inherited condition, but there is a good chance that a person who develops in a household with a parent who has BPD would also get BPD is higher than usual because of strong environmental influences. There are some who beieve that personality disorders occur because people don't develop an integrated and fully socialized personality. Look up Dialectic Behavior Therapy and Marcia Linehan.