I have come to the conclusion that my mum is jealous of DH's family. She seems determined to create rivalry and dissent. For instance, she is always dropping snide comments about my SIL and MIL into conversations (it has been getting worse lately, which I think is connected to my pregnancy - she will apparently "never get to see" the baby I'm expecting although MIL will "always be there" - well, if you live 5 hours drive away and deliberately try to avoid doing the "long journey" then you are bound to see it less than someone who lives a 30 minute drive away). I'm getting so fed up of hearing about how my MIL is "favouring" SIL (when actually I think she's very fair), how DH's family are "scruffy" (ok, they aren't into the smart casual clothing so much as the very casual, but bloody rude to comment) and so forth. She also tries to wind me up about SIL and tries to encourage resentment of her on my part (SIL is basically fine, although I think she did go through a phase of being a bit jealous that I was the first to get engaged and married and also the first to get pregnant).
I know that my mum had a dreadful relationship with her own MIL (who to be fair was a complete PITA and openly favoured her other son and, by extension, mum's SIL and my cousin). It has crossed my mind that actually she'd like me to have a difficult relationship with DH's family, on the basis that she would then be the "favourite" parent. Tough for her - I like DH's family and get on very well with them. Every time she starts on, I tell her that her comments are not acceptable and that I don't want to discuss it further. In response, I get whined at "well, I'm only saying" or similar. Has anyone successfully trained their mother to accept the fact that actually the "other side" is not their enemy? If so, please tell me how you did it, because apparently plain speaking isn't cutting the mustard. How can I get across to her that it isn't a situation where there is a winner and a loser?