Don't do a thing; this is between your husband and your father. I was wondering when this would happen.
If your husband tries to accuse you of meddling, tell him the truth -- that you didn't say anything to your parents about it and that this is a result of his actions.
And yes, it is going to be put pressure on your H to put on his Big Boy Pants and start acting like an adult. Which is what this R needs if it's going to move forward, because he is cake-eating like nobody's business.