I know who my dad is, I've met him a few times, but I don't...

I know who my dad is, I've met him a few times, but I don't even call him dad. I know it sounds horrible, but I don't even see him as part of my family, to be honest. If you want the truth, it doesn't bother me because I don't know any different. I just know that me and my mum, that was my family.