He somehow got from a password to a PIN, I'm not sure how, since he can't explain it. But he didn't know the PIN and whatever his password was, it wasn't any longer. That also seemed to applied to the Microsoft account and thus any obvious pathway to reset the bloody thing was closed off.
They can't really explain or understand computers. This one was originally set up, I assume, by PC World, but I think they let my sister's boyfriend the Mad Meat Man* lose on it at some point, and he knows less about technology than they do.
Anyway, I'm now admin. My mother has already relieved my father of any means on online purchase since he'll give his card number to anyone who asks. He's always been credulous, forever wandering home with obviously stolen stuff that someone had given or sold to him down the pub. No, no, he said it weren't stolen, he's not like that. Ah, so you bought it off the bloke who's just out of prison then after his most recent of several spells for nicking stuff then. Welcome to my childhood. He once bought home an entire pig (see the footnote).
*he brings my parents big bags of meat, for which they love him, I suspect, far more than me.