At first I answered with snark: “Good question. Why DID I have three children?”
Then, I tried some inappropriate humour: “Too much wine and too few condoms.”
Then, I tried to answer like a good, caring mom: “Because we decided that three children was what we needed to make our family perfect.”
Finally, when I had run out of answers, I asked him his thoughts on the matter. Here it is, from the imagination of a four-year-old:
Bart: Lisa, Maggie and me climbed the ladder and were fixing the roof with a hammer, a wrench and a saw. You weren’t there yet, because you had to work. Daddy had to work too. Then, we needed help with the roof, so we took you off the shelf and you climbed the ladder.
Me: So, does that explain why we have three children?
Bart: Yes, because we three liked each other and liked to build the roof.
Me: So, Mommy and Daddy climbed the ladder and picked you to be our three children?
Bart (laughing): Nooo! You didn’t pick us. We picked YOU!
The funny thing is that he has repeated this tale over and over, like it makes all the sense in the world.