Hi:
I’m trying to accurately reproduce your observations but the overall setup is unclear to me and I hope that you might answer a question about this passage:
” … My 7yoa iPad is no way associated to my 17yoa iPhone (don’t want him to have access) … “
I’m guessing that the “him” to which you’re referring is a 7 year-old child (and that “17” was merely a typo ??? (I’m also not familiar w/ “yoa”)
But … there can’t be an AppleID for a 7-year old child without him/her being part of a “Family” … within which you presumably are a member as-well ?
And members within a “Family” DO receive additional privileges / sharing within Apple’s ecosystem that “standard / non-Family” AppleIDs normally would not.
Looking forward to your clarifying reply.