He can take the fifth on any questions in regard to his own conduct and can refuse to answer any questions regarding his wife.
Another good reason to marry.
well, sure, he can take the Fifth, but wouldn’t you really rather hear him say ..”damned right I called! that $*#&@ was abusive to my sister-in-law and her son, threatened to kill my father-in-law, drove his trooper car under the influence. And the Commissioner wouldn’t fire him because of union pressure”