"Daddy…" a little Fred Weasley started to ask his father.

"Mm, what?" George looked down from the love potions he was re-stocking at his store.
"Why do you only have one ear?" Now, that shocked George.

"Huh?"

"I asked mum but she said that was something for you to tell me. You lost it a while ago, right?"

"Well, you see." George said, climbing down from the ladder he was on and squatting down to his sons height, "Back…a while ago, when uncle Harry was fighting Voldemort-" "You me You-No-Poo!" Fred giggled, having seen the old sign before.

George smiled, "Yes, You-No-Poo. Anyway, when uncle Harry was fighting You-No-Poo, I lost my ear."

"Oh. Was that the same time uncle Fred died?" Fred asked. He'd always loved hearing stories about his namesake.

George smiled sadly. "Yes."

"Oh. Is the hole in your ear why everyone jokes your Saint-like and holey?"

"Yeah." George was a bit proud his young son already got that joke.

Just a random idea.