my uBPDw progressively alienated and villainized every member of my side of the family for regular every day thoughtless kinds of behavior that people do such as calling our children my "step children" when introducing them ... .Numerous small things piled up to make them all the worst people in the world to her. No effort of attempting to communicate from them swayed her for long, always finding a new thing to levy fault against my parents in particular.
I definitely can identify with this. Although I'm sure many have commented on this fact, i'm glad to hear that this animosity towards a partners family members is just another BPD trait. (sorry that anyone has to suffer though) My uPBDw has hated my mother from the day she met her. A simple benign comment made in jest, is often brought up in conversation. My brother and father (although he really is a jerk) are also on the hated-list. But I'm also held accountable for the fact that my family has never had anything to do with my wife and kids. Its impossible when any mention of them just results in negativity and animosity.
As far as newbie here is concerned though, the BPD relationship is almost entirely one sided. If you can accept your role in the relationship, it can be palatable. Just make sure you have some kind of external support to help you reinforce your own internal strength. For me I have my psychologist, and a belief that God keeps me exactly where he wants me. I can't say that others will agree, but I still have yet to convince myself that God wants me to leave the woman, I love and bring anymore pain to the family He gave me. For better or worse... .in sickness and in health.