I'm getting married in a weeks time and my MIL to be has asked (via fiancee) that I call her mum. To me that term is reserved for my mum, and I've offered to call
MIL 'mother' or any other alternative, but since her other DIL calls her 'mum' she's insisting only that term will do. I've refused on the basis that I don't like being told what to do, it doesnt feel natural to me, and she isn't very motherly (am already 21weeks and she hasn't ever asked me how I or the LO are doing, although she is happy to tell me what I should or shouldn't do at my wedding). AIBU?