I've always had a sense of humor and did use it on my kids often but when it came to my stepson flipping me off and tell me to go **** myself, I couldn't find any humorous way to deal with it or respond. And, he was an adult too so it is different than a young teen ager.

I do agree that the husband has to step in and do something here. However, if he refuses, what is she to do? Seems the responsibility of this child has fallen on her shoulders.