My cousin has a PSP and i have a PS3 . a few months ago i gave my password for my Online account on PS3 to him so he can go on the playstation store. That day he was downloading game demos on his psp using my account. Few months later on my PS3 i saw somebody charging games on my account that were approx. 20 bucks each game, there were also PSP themes (wallpapers) on the psp, the themes that were charged were called Bunnies pinups, celtic maidens, bikini fashion show etc. So obviously it's my cousin buying them but his mom is convinced that he didn't do anything. So is there anyway that i can prove to his parents that he is lying and he did do this.

Thankyou