Ask the grandparents if they remember.

"have you ever had to ask or answer this question?"

TahaLikesYou 

https://youtube.com/shorts/a1HsICKiLTw?si=e3eg7GQX17StywEI

"how do children come up with these questions"

TahaLikesYou

https://youtube.com/shorts/n5Ly9tRxBwo?si=rZo9qvXrSj8QiB3v