why is a monkey. monkey uncle?

Question

monkey

Answer 1

Origin: The publication of Darwin's theory of evolution in the "Decent of Man" was greeted with derision and a great deal of skepticism. The idea that man is related by a common ancestor to apes and monkeys was considered the most outrageous of the claims. "I'll be a monkey's uncle" was originally a sarcastic remark by a non-believer of Darwin's theory and was intended to ridicule the theory of evolution.