I considered my little brother to buy a Fortnite acc… Since I'm afraid of being scammed, I thought I'll get some data! He sent me his ID number and address and his cell phone number… Am I sure now and can I report him at any time in the event of fraud?
You can always display
Yes you can.
You have no proof that this data is real. Stay on the safe side and don't buy such a dubious Acc.
Maybe fake? You could then display against unknowns, but whether it works is a difficult question. At least need at least 4 months to trace the one back or that something happens
Better buy him the Battle Pass or skins in the shop