Baby sitting

[hypnopotamus]

I am a grandmother in my fifties and still working full time, I have 3 grandchildren to 2 daughters, both of them lone parents in their 30's, one is gong back to college so is in the process of changing her job to fit round this, she will be working evenings/weekends and although she is doing this she has not asked if it is ok for me to have the kids while she works ( I work office hours and she will be starting at 6pm) I know from past experience that this will be just expected of me. AIBU to not be happy about this?

Agree that you should ask what arrangements she has made for childcare. That opens the conversation up for you to be able to make it clear that you won't be able to commit to regular childcare. And don't let her guilt trip you over it. It is entirely reasonable that you don't want to work all day and then effectively become a childminder in your evenings. People who assume that the grandparents are there to provide free childcare have a weird sense of entitlement