Transfer game started from parent account to child account

you can indeed transfer money from a parental account to a child account, can be done accidentally too, not sure if there is a way to transfer back as child account cannot transfer money.

You can't transfer licenses or content from one account to another.

The accounts Parent / Child are separate accounts. The parent account just manages the child account.

The child account will remain a child account until the birth date that was used for that account reaches the age of 18.

Nothing can be transferred between accounts.

You can create a child account on your current parental account. You can not transfer games, saved progress etc. You can set the parental account to Home Xbox and the child account would have access to the games but not the saved progress.

It is not Microsofts fault that a child account was not set up.

unfortunately the Xbox account IS the Microsoft account and therefore the property of the father, nothing can be transferred as he is the owner of the account, there is absolutely nothing that can be done apart from start from scratch with a new account. what should have been done in the start is to create a child account which would have meant that your child had their very own account and you would then be the parental guardian to that account until the age of 18.