For context and so I don’t drip feed, I’m one of 3 kids. 1 brother heading away for Easter hols, one away for the day.
We are geographically and generally closer to my side of the family although the whole family live in the same city.
DM is alone and has been for maybe 35 years. All Christmas days and Christmas Eves are spent with my family although we see MIL for an hour Christmas morning. Easter is generally also my family and a dinner hosted by me usually and the odd time my DB.
My husband is from a big family, lots of cousins the same age etc. Mine is much smaller, just a couple of cousins.
This year we have a DD sports even that means that we won’t be hosting but DM wants to do a dinner for just us in the evening.
MIL has asked us up for a family dinner as well.
I want to say yes to MIL for a couple of reasons - we never spend events with them and two the kids would love a big day with the cousins.
AIBU to say to DM that we do dinner Monday instead.
She will be very annoyed but is very easily offended to be fair and is very much of the poor me on my own type of mother (she’s never ever been alone for any event and is brought on holiday at least one a year by one of us)