I would amend it slightly--a happy face around your boys makes sense, but you don't need to put on a show for your stbxw or her parents.
Good point - I can do that. I wonder about her parents because they love me. I don't see her telling them anything more than we're separated. Her mom still chats with me on FB and I am pretty sure they'll be gutted if they found out she's doing what I'm guessing she's doing.