God I'd never go on holidays with my inlaws!! I think you're all very accommodating and brave!
We have been away with my folks, but Stu really enjoys it and encourages it, so of course I don't mind! But sometimes it's nice to go away just 'us'. And with Christmas baby's first is always at home for us, this year we're going to Stu's nanny's and next year we'll be home. His family live all over to it makes it really hard and Stu always feels torn between his mum and his dad. We didn't see his mum at all over Christmas last year and she got Liv's birthday wrong, hence why I don't have much time for her!
EDIT; I've been to Disney twice, very lucky, and I'd love to go again, but will be a few years off, maybe when my dad hits 60, that seems a good time to go! We stayed in a hotel first time and a villa the next, definitely recommend a villa, they're reasonably priced, massive and much more comfortable to chill out in!