Can I apply for a British passport if we still have my parents old?
Passports and citizenship are two very different things. Why do you want a passport? Or do you just want citizenship? There are two issues: To get British citizenship, you need to fulfil certain requirements. The UK has a particularly bad track record when it comes to citizenship; I have known many British citizens who have been refused entry to the UK. Your parents citizenship (whether still valid or revoked) may help, but that depends on how they got it. So take David Slatterys advice and contact the British Embassy or High Commission. To get a British passport, you need to be a British citizen. You should then just apply for one, pay the money, let them do their checks, and you get the passport.