Spending Christmas with DH, DS and the in laws. We're weaning DS so mentioned in passing bringing his high chair so he can sit with us during Christmas dinner (if he's not napping or anything like that) he's very alert and active and gets arsey if not being entertained. He loves being in his high chair and round the table and it's his first Christmas so we're a bit excited (yes I know he worn remember it)
MIL has said we can't bring his highchair, as her other sons baby will only be 8 weeks old and can't sit in one and we can't leave out one of the babies on Christmas Day. I laughed thinking it was a bad joke, but no, deadly serious.
We sort of ignored and thought we'd deal with it on the day, but had a text from 8 week olds mum saying that MIL had told her we were going to try and leave her child out and that she's not happy about it. Her baby will be the only one not in the Christmas dinner photos if we bring our highchair 
I said well obviously baby can be held up in the photos if that's what's upsetting you, DS is at the age where he doesn't just nap constantly and wants to be involved and entertained and it's nothing to do with leaving her child out.
It's totally ridiculous and DH is now saying just to leave the highchair at home to avoid drama. I've never had any issues with the in laws before and I'm mind blown by how stupid this is. Or am I BU? Is this a thing?! If one babies on the floor they all have to be??