Parental control + child account : no dedicated session possible for my child (12 years old) ?

Hello community !

We have a new mac mini M4, Sequoia 15.3, for the family. In order for our child (12 years old) to use it with parental control, I set up a family account, then a child account with parental control over it. (I have no Iphone and just wand the controls on the same mac we are all sharing).

But no session for our child was created. Then I attempted to create a session for him, but his name and account did not appear (from the family account) as a choice for a new session for him. In other words, now I have a session for him with is name, but completely out of the realm of the family accound and parental control.

Can someone please help me merge these 2 ?

Thank you very much !