Well, what would happen is that the hubby as the guardian would ignore the subpoena, and that would go to federal court. I don't really see how Greer is in the loop at all on the contempt thingie, procedurally. Do you?
No, but the judges, either state or federal, are going to feel the same way about this. None of them would welcome congressional interference in their pending orders. Nor should they, from a constitutional perspective.