This is a case of are we being unreasonable?
My Mum comes to us every Xmas day and stays over to Boxing Day, DH is great and accepts this happens. She stays until around 11am until we go elsewhere or drop her off home, unless I'm working and she has to leave around 6.30am. Anyway, it's assumed at this stage she's here until 11am Box Day.
This year we're going BIL1 around 12.30pm Box Day. Other BIL2 has invited us to pop into his between dropping my Mum off and going to BIL1, to see two nephews open their presents (he's not an entertainer but knows we like to see nephews open our presents), so can easily fit in. BIL1 has realised that his (and my DH's) Auntie is on her own over Xmas. She's a lovely, lovely person and BIL1 has messaged asking if we'll go and pick up Auntie to take her to theirs for lunch. DH has said no, it's too much as a 110 round journey and can't do between other things (not going into details as BILs 1 and 2 don't speak) BIL1 is very persuasive asking why, saying DH is being touchy, and I know it's going to get tense. I'd happily have Auntie for Xmas Day, but know she really wouldn't want to stay at ours or theirs.