but he is usually such a calm, gentle man, and this is a side of him I haven’t seen before
Well no, that’s because you’ve only been together 6 months. You’ve seen barely any sides to him in this time! With or without kids, at 6 months you’re still getting to know each other.
I'd be at him telling off my kids, when a, you're supposed to be away having fun and b, when he hardly knows them, much less is in a parental role. He should wind his neck in
Really?? So he’s good enough to take them away and no doubt contribute to feeding them by buying food/drink etc yet he’s not allowed to tell them off when they’re being naughty? Sod that...
When I say telling off, I mean things like telling them it’s not ok for them to splash into puddles that then splash him. Or for them to make noise that might annoy the neighbours
But none of that is okay? I’d get pissed off with it aswell! It’s not okay to splash people. If you’ve told your kids to quieten down but they continue then yes they should be told to stop. That’s just teaching them basic manners and respect.
OP, I don’t know this man nor do I know you or your children. I also think kids should be allowed to be kids and that involves letting them jump in puddles - however if they’re jumping in puddles and getting other people wet then that’s not okay. Just like being loud and noisy around neighbours when you’ve asked them to quieten down isn’t okay.
After 6 months you barely know this man so to be going away on trips together and expecting him to have the patience of a saint around your kids that he barely knows is too much.
If he’s good enough to stay with and contribute towards your kids by feeding etc then he should be good enough to have a say in boundaries. If he isn’t, and if you don’t want him telling your kids off, then it’s too soon and you shouldn’t have them around each other!
Personally this would be a deal breaker for me. If I’m good enough to be around someone’s kids and they’re pissing me off, then expect me to put some boundaries in place. If not, get the kids away from me.
Regardless of anything, I think it’s far too soon for you and your DP to be having trips away with your children after just 6 months.