So it never officially came up. My sis and BIL started making comments to her in front of me and I kind of gave her a look like I was extremely uncomfortable and tried to stand up for her without pissing my sis off. I tried to change the subject other times.

I just made it a point to hang out with my niece and just treat her like an adult. I know that's what she wants/needs. My sis really does treat her like crap sometimes.

Something that really made me angry....we are all standing there making dinner, my sis started making little backhanded comments about my niece and she just walked away. My sister then called her an idiot! My niece of course got upset and my sis said "well if it were me I would try to defend myself" and my niece said "it's impossible to defend myself against you" and that shut her up! I couldn't believe my sis called her own daughter an idiot! Not to mention in front of other people! When my niece said that I told her "well she has a point on that one!" and walked out.

My sis has been talking about divorce for a while and I think it may be necessary at this point. She has become so angry with her life that she is treating her own children like total crap. I want to keep my nose out but I can't watch her do this to my nieces and nephew. Our mother did this to us growing up and it was because she was miserable in her marriage. Since her and my dad got divorced she has done a total 180. However, I hated her until very recently. If they hadn't gotten divorced, I'm not sure we would be speaking now. I'm afraid to see this happen to her and her eldest daughter.

I don't know what to do!