keep telling your boy that YOU ARE HIS DAD ! let the mutant step dad get in your face AND LET HIM HIT YOU! have him arrested for gbh and then apply for custody due to the violent behaviour of your ex's partner.
my daughter was taken to spain and i was stopped from seeing her for 5 years, they changed her name etc etc . I now see her regularly and i realise that no matter what anyone has ever said about me she loves me and will never see anyone else as her dad .
I promise you m8 the same goes for you and your lad , no one will ever be able to take the blood bond away and even tho you might not see it right now its there .