I'm not a stepmum but where my own daughter's concerned I never have holiday envy, I love that she and her husband are seeing the world, they're a well travelled generation, I wouldn't dream of judging them for how they spend money. And I think you're getting the conversation about your Lake District holiday out of proportion. I've just had a 'low cost' week in Scotland which turned out to be as expensive as going abroad, but so what? My choice, my money, I don't care if someone asks thinks I spent too much, nor should you.
It sounds like a number of things have built up to make you feel aggrieved Zorro21, but you married someone with 5 children - it was never going to be plain sailing was it? If this SD asks an intrusive question again, don't get annoyed just sidestep it e.g. we got a last minute bargain. I'm with pinkjj27, it's not worth letting it cause a family rift.
Do you still wear you original wedding and engagement ring
To think that London, or anywhere else for that matter, does not belong to any one demographic