__-in-Law; Butt of Many a Stereotypical Joke
Puzzle 1 of Jokes and Gags Medium Pack
Question is: __-in-Law; Butt of Many a Stereotypical Joke
and the answer is: MOTHER
Word Meaning:
MOTHER — A female parent, especially of a human; a female who parents a child (which she has given birth to, adopted, or fostered).
Definitions from Wiktionary.