"Who is Amy's mother ..." What kind of joke is this? ?

Who is Amy's mother? It's flowers, because peanuts! Who is Amy's father? It's a butterfly, because it's a recent flower! Who is Amy's grandfather? It's popcorn, because he has already hugged rice and flowers! Who is Amy's grandmother? It's a wonderful pen, because a wonderful pen gives birth to flowers! Who is Amy's husband? It's a mouse, because mice love rice!