Am genuinely not sure what the feeling is on this so would appreciate opinions!
I'm 36 weeks pregnant with our first baby and have had two very wearing conversations recently with my MIL about who gets called what. Both DH and my parents are divorced, and both of our fathers have remarried while mothers have remained single. We live in the same village as my FIL and his wife and see a lot of them, they've been together for over 20 years (she wasn't the OW or anything, they got together long after MIL and FIL had split). MIL lives other side of the country and we really don't see her that much, not through bad feeling or anything, but because that's the way her relationship with DH has been well before I came into the picture, he doesn't make masses of effort to phone regularly and neither does she. Regardless of that, she has been insisting that when the baby comes FIL's partner must not be refered to as Grandma. Her actual words were "I'm prepared to share the baby with your Mum, but not anyone else".
My Mum is fine with my stepmum also being known as Grandma.
Am I being unreasonable in continuing to plan for all four mums/stepmums to be called Grandma (or whatever derivitive of it they fancy)? I think otherwise it will be confusing for the baby once it gets a bit older, and the two stepmums have been hugely welcoming and kind to me and my DH over the years and are very excited and supportive about the baby, I would hate to make them feel excluded. AIBU?