I watched this movie a few years ago and can't remember what it is called.

A girl and a guy go on a trip to vegas and they tell their kids it is for a busieness trip, but it is really to go away together. They end up getting married and having to deal with telling their kids. The woman had a few kids of her own and the man does too. The woman is more organized and the man isn't. They fight about this she gets mad and leaves him. They end up getting back together.it is kind of like yours mine and ours but isn't.

I don't know but let me know when you figure it out please :)

Sounds like I Do, They Don't