I know IANBU, but just feeling sad tonight.
DD is 2.5 and new baby is due soon, all being well. We're lucky in many ways, but the loss of my DM when I was quite young means that she's missed out on the main thing she wanted - grandchildren 
I just keep getting these waves of sadness at the moment about what she's missed, and what they've missed. She would have loved every hair on DD's head (even when the little beast is pouring her dinner on the floor or something!) and as an infant teacher she would have been brilliant with her. I'm sad that I've missed out on seeing them together. So many of my friends rely on their mums for childcare and seeing their kids with their grandmas always gives me a pang. And I want my mum there for the upcoming birth too ðŸ˜ðŸ˜
My MIL and my DF are brilliant but - it's not the same as your mum, is it? DF has never changed a nappy in his life!!
Sorry to waffle, just really feeling it tonight and thought there would be other posters who would sympathise!