Our DiL loves family holidays and goes away at least twice a year with our DS and their 2 children plus her parents (amicably divorced), and her brother plus his family. One year our DS, who is an only child, was keen for me and OH (as his only close relatives) to join them all at a big house in Cornwall which we did. Sadly, we didn't really enjoy it. We'd only met our DiL's family once before (at her wedding to our DS) and soon realised that we had absolutely nothing in common. The holiday became a test of being polite and trying to get along. Even our attempts to spend time with the GCs were thwarted by "No 1 Nanna" who sees them regularly but wanted them to herself. The only other time we have tried a family holiday was when we paid for a week in a lodge with DS, DiL and GCs. I made it clear beforehand that I didn't want to be lumbered with all the catering and guess what? I'm sure family holidays can be fun, but think carefully first.