Editing a group family picture?

Last weekend me and my partner took a couple of group pictures with her family. Most of them turned out great, but in the best photo the youngest kid is covering his face and the dog turned weirdly so it just looks like a ball of fur. The dog and the kid turned out fantastic in other pictures, but the kid sits in a different place so I can’t easily copy/paste him.

Is there an AI tool that can help you mix the best elements of two (or more) images, such as family pictures? I’ve looked around for a while but can’t find a solution to this particular problem.