Hey @LilWhiteRabbit0,
Unlinking accounts used for Apex can actually have a number of side effects as seen here, so generally speaking we'd suggest avoiding this altogether where possible.
If you have a sibling wanting to play, they should be using an account registered with their own information instead so that's kept separate.
Don't forget that if you feel the ban on your account was placed there incorrectly, you can appeal this with our Terms of Service team here.