Child / Adult account comingled... Help!

Devices:

Ipad Air: Used by me (fam organizer)

mac mini: Used by me

Ipad 2020: Used by child - age 8

all the same apple id...

Ipad pro: wife's apple id

ipad 2019 used by preschooler child apple id

android phone: me

iphone: wife

Started back in apple ecosystem with the ipad 2018 for usage with autistic son

content has done wonders for him, his social skills, language and math, he's on his second ipad at this point.

Mac mini is used by me for recording music, love it.

My end goal here would be to reserve my apple id on my ipad air and mac mini and transfer all his paid apps to

his own apple id without having to repurchase everything or losing any digital assets that are not login based such as roblox.

Of course I should have set him up with his own id out of the box, but, I didn't have any other items in the ecosystem at the time.

Thank for your help. Apple store has turned me away twice and given me phone numbers that dead end or are just wrong.