My SIL seems to put on a front, but in the background is really causing divides. I do struggle a bit with people who seem fake, but want to try with her and don’t want to cause trouble between her and my brother. I’ve always been pleasant to her, try to find redeeming things about her etc. It’s hard as if I tell my brother things going on in my life, I understand he might tell her, but this is then used as a weapon. There’s something really off about her that’s become more apparent over time. It’s all done in a subtle way. I don’t want to have to put a wall up between me and my brother. I have tried grey rocking but it’s hard sometimes. Tips?