forgot my nano pass code.

Well i just got the brand new white ipod touch for christmas, and i was thinking about giving my old pink nano to my little sister. I totally forgot the lock code.. like i tried every code i've ever used and so i look up what to do online, and it said restore your ipod... i tried but it said my itunes email was an email i have never heard of and had no access to. I have no idea what to do.