Can you transfer games between accounts?

The transferring of content between accounts is not possible

There are a few games that will allow saved games to be transferred between accounts, but overall nothing can be transferred between accounts.

License transfers will only transfer licenses between consoles, not between accounts. Have your brother try downloading the game on his account and then see if you can access it.

Nothing can be transferred between accounts. License transfers are only used to transfer licenses between console if you were to get a new console.

You can try redownloading the DLC to see if that allowed you to access it on the new account, but the game saves would still be tied to your original account.

You cannot transfer any games etc between accounts or to new account. You can transfer account to another console by loging on the Console.