If Apple billed you for a SuperGrok subscription and you want a refund, go to...

https://wiki-planet.win/index.php/I_Used_a_Family_Member%27s_Apple_ID_for_SuperGrok,_How_Do_I_Refund_It%3F

If Apple billed you for a SuperGrok subscription and you want a refund, go to reportaproblem.apple.com. Sign in with your Apple ID, find SuperGrok under iOS Subscriptions, and request a refund