Answer:
What do you call the mother-in-law of your sister's husband?
One might hang a locket from this
Sitting down you have it, Standing up you don't.
They can be long or short; they can be grown or bought; they can be painted or left bare; they can be round or square.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair
What is it that no man ever saw, which never was, but always will be?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?