My MIL has been having having a tough time with my FIL. He's a bit of a bully and over the years she hasn't really stood up for herself so he continues to get away with bad behaviour. They are both in their 70's and work really hard as they have a big pile to maintain and no cash to maintain it with and this seems to be the root of their problems. Recently and by this I mean over the last couple of years she is leaning on my DP expecting him to 'have a word' with his father when things get too much for her. His relationship with his father has been compromised by this to the point where they have huge rows and in the most recent one his Dad got physical with him and it's not the first time! DP worries about them constantly and he just doesn't need the agro. MIL complains to me and other family members about him too but doesn't do anything to address the problem directly with him hence my frustration with her. I told after the latest episode that I thought she was partly responsible for the situation she found herself in and that I thought she should stand up to him more. I think it's wrong to burden her son with her marital problems. AIBU?