Is it common for grade school girls to send Facebook friend requests to the parents of their friends?

I’ve received two friend requests this past week from friends/classmates of my daughter. These girls are 10 years old and I have not met their parents yet. I did accept a friend request from another friend of hers, but she’s a closer friend and I know her mother.

I find it odd that a parent would let their child send a request to an adult they haven’t met. I would not want my daughter doing this if she had her own account. I’m wondering if I should accept the requests? Does this happen often with grade school children and pre-teens?

There is one thing to consider. It’s possible the friend requests were accidental. I was tagged in a group photo of the girls and it’s possible one of the girls was browsing my timeline and accidentally hit “Add Friend”. I’ve done that once or twice myself, possibly more that I’m not aware of.