Answer:
Fred and Wilma's child, named after a stone.
He is known to commit a friendly home invasion one night a year, never taking but always leaving stuff behind
I am something that floats. But after a period of time I fall.
What can you blow up and keep intact?
What's at the head of an elephant and at the tail of a squirrel?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.