You got it all wrong. They're mad because they wanted OP to go with them, so when they wanted to go out and do something fun on vacation they would force OP to watch the kids. But since OP didn't go they had to watch them

the way you explained it didn't make it anymore clear to the guy who got down voted, the key word here is the adults wants to "trick" OP to coming on the vacation, with false pretense that OP would be sharing the enjoyment of the vacation, they didn't plan on telling OP they were designated babysitter until they were already stuck in the hotel room with the kids, OP's parent probably told OP weeks later after the failed scam when OP was confused why everybody was giving OP the cold shoulder

Pretty sure since OP is worried about not talking to them for only two weeks, they normally are on good terms. Cutting them out for one incident would be rather silly.

Yeah but it's hard to imagine that people who would act that way have only done something like this once.

I'm noe who gets slammed for not having kids. I'm in my mid-20s and my husband and I have no intention of having kids at any point. Adoption down the road? Maybe. But right now, we have no intention of having kids because the reality is that we are not willing to give up our lifestyle to accommodate children. And I just don't see why that's such a huge deal to some people.