A 4-year-old boy says to his dad, “Dad, I’ve decided to get married.”
“Wonderful!” says his father. “Do you have a girl in mind?”
“Yes. Grandma.”
“Grandma?”
“Yep. She says she loves me, I love her, and she’s the best cook and storyteller in the whole world.”
The father smiles and says, “That’s very sweet, but there’s one small problem.”
“What problem?”
“She happens to be my mother. How can you marry my mother?”
The boy shrugs and says, “Why not? You married mine!”