Given the task definition and input, reply with output. You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: AMERICAN AUTHORS 
Clue: The grandson of a humorist, the son of a children's author, his first novel in 1974 was huge bestseller

peter benchley