Is it BPD or difficult personality

[Pburg67]

New here and found site when researching BPD symptoms. I have been married for couple months to a wonderful man. Problem is his 21 and 19 year old daughters are very difficult to be around. Attention seeking 24/7, manipulative, demanding, drama to the extreme. Bio mom also exhibits same behavior. Their toxicity has been the only issue husband and I have ever argued about. My husband will not call out their behavior so as not to rock the boat. He often gives in to their demands just to get off the hook and so they won’t “hate me” (step-mom). I was previously married to an NPD and also have mother and sister with personality disorders so I know why they trigger me. Any advice would be appreciated.

Our objective is to better understand the struggles our child faces and to learn the skills to improve our relationship and provide a supportive environment and also improve on our own emotional responses, attitudes and effectiveness as a family leaders

[Swimmy55]

Hi and Welcome,
 While I don't have step kids, there are members here that do and will chime in.  Meanwhile here is a post from this forum about step parents
https://bpdfamily.com/message_board/index.php?topic=302116.0
Do your step daughters live with you?