That's what my father told me...

We are watching a TV show, it features a family get-together where kids see their grandparents for the first time in a while. The grandfather is sort of stooped over and seemingly shorter than his wife.

Ava: "How come the grandfather is shorter than the grandmother"?

Me: "Thats what happens when you are married to the same person for a long time, you start to shrink".

Ava: (to Renee): "Is that true, Mom"?

Me: (continuing), "Yep, before my grandfather passed away he was 16 inches tall".