The 2 DSC are here EOW and holidays.
A few times now one of the DSC has decided to just come one night instead of 2/3 or go home part way through holidays- absolutely fine with us, and DH fine to do extra travelling to facilitate this. We see this as them getting older and making their own decisions on their time.
All going fine. But now there's a weekend coming up next month where we've planned something on the Saturday and DSC 1 had decided to do something else on that day and come in the evening instead. We've booked it, me, DH, DSC 2 and DC. DSC1 was fine with that. But mum has kicked off telling us to rearrange it and how unfair it is not to treat all the children in the family the same.
I see it as DSC1 had a choice at the time and chose. DH is now stuck in the middle and feeling guilty.