Why am I the only one?

Jonathan: Mama?
Me: Yes?

Jonathan: Why am I the only one in this family whose legs hurt all the time?
And why am I the only one in this family who has a sideways leg?

Me: Um, I really don't know, buddy.

He walked away into Anna's room, and I stalled for a minute, thinking, "Oh, Lord, what am I supposed to say?"
Then I followed him. He was standing in Anna's room, pulling at the bottom of his shirt and rocking back and forth on his legs like he does when he is upset, about to cry.

I said, "Jon, Mama's sorry, I wish I knew why your leg hurt and Daddy and I both wish we could make it better. There are lots of things about you that are different and special, and your leg is just one of them."

Jonathan said, "No. There are three things that make me different from this family.
The first one is that I have legs that hurt all the time.
The second is that one of my legs is sideways.
The third is that I DON'T like potatoes."