We're on the same boat. My kids only know Linux, and I just got my wife on Fedora about 5 days ago.
My 9 years old is on Zorin (his choice) 658-3330 on his PC, BUT and my 10 years old daughter is on PopOS on her PC and Nobara on her laptop (also her choice).
I have full control of the network with a PFSense full of VLANs, Adguard Home and some other goodies, and my wife and I have all the credentials to our kid's accounts and devices.
Any distro they feel comfortable with will do, as long as you can manage it.