The short answer. . . . About half.
My father in-law is pretty easy going, laid back, and easy to get along with.
My mother in law however is. . . . . well, she's the devil. She hated me from day one, she tries to contol everything about my wife, our children, and me. Nothing we ever do is good enough for her. Though I would say that (AFTER 12 YEARS) she's lightened up a bit.
But no, she's still compulsivly evil.