Little Paul says to his father, “Daddy, Daddy, I want to get married.”
His father says, “For that son, you have to have a girlfriend.”
Paul says, “But I’ve found a girl.”
“Who?” said his father.
“My grandma.”
“Let me get this straight.” the father says. “You want to marry my mother? You can’t do that.”
“Well, why not?” says Paul. “You married mine.”