DH and his brother are not very close. They're quite different characters and have drifted apart over the years to the point that they now barely speak.
A little while back we were invited to BIL's wedding. It's happening abroad, near to where his fiancée grew up. The logistics meant that taking our toddler wasn't really feasible (20 hours travel time each way and an evening start, so DS would miss most of the proceedings anyway) so I offered to stay at home with him and DH would go on his own.
DH however decided not to go. He said his relationship with BIL isn't in a good enough place for him to use the annual leave and money to go without us. I'll also be in the late stages of pregnancy by that point. He thanked his brother for the invitation but said it wouldn't work with DS so as a family we'd be staying at home. Very happy to celebrate with them back in the UK at some other point, however.
BIL seemed to accept this but his fiancée and parents are very angry with us both, and it's difficult to see the relationship recovering at the moment.
DH is pretty resolute that he's doing the right thing but every so often asks me what I think. I've said I'll support him either way but if he doesn't go that is probably going to draw a bit of a line under his relationship with his brother, so he needs to be prepared for that.
Beyond that I'm not sure it's my place to intervene further - is it? I don't like lingering conflict so this all feels quite uncomfortable as I can't see an end point to it. However, that's a bit of a selfish view, and I still don't think it's for me to tell DH what to do either way. Is that fair or is there anything else I can do to help the situation generally?