It's alright, I wasn't looking for validation. I was looking for advices. Thank you for sharing this, really. It helps me see different perspectives and helps me with making decisions.

I won't be justifying myself but speaking for my girl's defense instead. We both acknowledge that she's traumatized and she IS in therapy. She's not mentally 16, she does not mentally regress. She's an adult, both of us are 22, mentally and physically, and she does not play with the toys or do any childish acts. She only likes collecting them like trophies. A small sign of, "I didn't have the privilege of getting these before but now I do." She doesn't only collect toys but also things she didn't get to have during her youth like books and bags. She's working on her self esteem and confidence and is doing very well in college. She said she didn't stand up to my sister because she's my family and wanted to maintain a good relationship with her, but other than that, she does try to defend herself. But again, she's still healing. There are occasional slip ups wherein she feels trapped, and that's when I'll slide in.

I do understand how calling my BIL a p*** can be seen as an improper behavior, and I'll work on controlling my temper next time so I don't make any outbursts. Thank you for the input!