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Help guys, applying for first passport after naturalistation

For fathers section, I don’t know what to put as my birth father died when I was 1 and my birth mum divorced my stepdad when I was 6-11, so I didn’t really know my step dad after the divorce. Do I still mention my dead birth father? That’s what I did for naturalisation and wasn’t questioned or no problem about it...

But should I do the same for my passport application as I’ve heard it’s very specific

Please can someone advise,

thanks

Just fill in what you know, or n/a if known. Parents details aren't really required, not sure why they ask.
All you need is your certificate and current and/or expired foreign passport.