Why this happening is because your husband really cares about what your father says and thinks about him. See trouble between in laws is a common problem. You should not become hopeless so soon. You must have spoken to your husband about this, now it is time you speak to your father. You do not have to be rude, just explain to him your situation and I am sure he will understand. I am sure your parents have been very kind and sweet to your husband, but from what it looks like, your husband is very sensitive. Just tell your dad to keep that in mind when they meet the next time. However, if nothing works for you and your dad and husband still don't seem to go along well, then you can seek help from a family counselor.