This exact picture sits framed on our computer desk.
As Luke was admiring it, the following discussion took place:
Luke: "Hey, Mom, who keeped us when you and Daddy got married?
Me: "You weren't born yet, so no one had to keep you."
Luke: "Was I in Daddy's tummy?"
Me: Laughing... "No, Honey. Daddies don't carry babies in their tummy. Years after this picture was taken, you were in my tummy. Neither you nor your brother were born or in any one's tummy when this picture was taken."
Luke: "Huhhhh... Well, who keeped me when Daddy was born?!"