No , there’s no need to be in the same room. They can be in separate rooms and alternate nights with the kids and honestly I would go as well. Why would they go on vacation alone in the same room when he haves a girlfriend ! That’s a little disrespectful to your relationship that she feels that comfy to do that ....

That's ridiculous. Either I'm coming too, or he's vacationing as a newly single man.

Why it has to be in the same room? That’s weird. And as far as the “family” vacation, I would allow it if I was going as well since were all family now.

Yes because he’s a damn adult and I don’t “allow” him to do or not do anything.

I think this is stepping over a line. If they want to vacation with the kids, that’s all well and good, but separate rooms, and you should be able to go too.