I’m almost certain that my brother who’s 30 has BPD. I tried to tell him that maybe he should look into it the other day because of another big blow out he had with my mom while visiting her. He got offended and said that he doesn’t, and that it’s my mom’s fault that he acts how he does. He gets extremely aggressive with my mom and will yell at her for hours. My siblings and I kind of get upset with her because we feel that she should set boundaries. Like maybe blocking his number because he’ll call and harass her and send many awful texts. Or telling him that he can’t come over if he can’t treat her well. Is she adding to it by not setting boundaries or will it make it worse? Should we cater to him? And what can we do if he doesn’t see that he has a problem? I told him that maybe he should wait until he can control himself around our mom to come over again, but he got extremely upset about that. I ended up just telling him that he can come over and basically act how he wants to my mom and we’ll get over it because I felt bad. My family and I don’t know what to do. Please help!

Also, I’m not sure if this is the correct subreddit to ask. I just looked for “BPD.” I apologize if not.