My ex has a new GF, been together approx 4.5 months. Our kids (both under 10yrs) have met her a few times and she has stayed over at his and they have stayed over once with their dad at hers. He will soon be moving in with her and the kids will visit there on his weekends.
He intends to let her take our kids to a theme park tomorrow without him.
I have said categorically no to this. AIBU?