Name changed for this as it might be quite outing.
Suspect iabu but who knows.
So dh has three older children daughter 25 and twin sons age 22. Me and DH have two daughters together (8 & 10).
SD came over a few weeks ago and told us she is pregnant, lovely news, she's in a very long term relationship and they have their own house, decent jobs etc.. DH shocked but very happy and looking forward to being a grandad even though a fairly young one (he's 52).
The thing is is that now everyone especially dh keeps saying "oh now your going to be a Nan" when I say they keep saying it I mean constantly, I think half the time it's a joke because I'm younger than dh (40) but dh isn't joking and keeps calling me "Nanny ....". I got fed up of laughing it off or just saying no I'm not and today I just told him to stop saying it because I'm not going to be a Nan and I don't want to be a Nan which has really pissed him off! He asked why I was being so nasty (didn't think I was) and I just said that SD isn't my child so I won't be her babies grandparent, I will be a Grandparent when either of my two children have babies. I feel like becoming a grandparent is a very special thing and I want to be a first time grandparent to my daughters children (if they have children). SD has a Mum who she is very close to so I don't feel like I'm denying this baby a grandparent, it will have 4 of those and I will just be known by my name.
So AIBU? Do I have to be a Nan?