Hi, I'm German and my son was born in the UK to a British father. Trouble is, he's not on the birth certificate because he was in military jail when my son was born and we got married 2 weeks after his birth, so I cannot prove my son is British and get him a British passport (I only moved to the UK while pregnant). I have since tried to add him to the birth certificate but over the years he's always made excuses and said he doesn't need a piece of paper to know he's his son's father. We have now been separated since 2016 and he's blocked all contact. He denies that his son is his son (and even tells people the kid in the photos is his nephew, not his son), he never even responded to the court and lawyers after I filed for divorce (which has been granted without his input). he has also never responded to the child maintenance service, he owes his son over 5k in unpaid child maintenance and they said the last step now will be to put him in jail as he's never responded or paid (they now take pennies out of his benefit payments before he gets them). He won't tell CMS "That's not my kid" (as he never responded to letters, calls or in person visits) which would trigger them asking him to do a DNA test (which he'd refuse, so no point even thinking of this scenario really). I'm thinking of filing for a declaration of parentage but even that can't force him to do a DNA test. How do I prove he's his father? If he refuses the DNA test will the court say it's obvious he's the father? Or will I have wasted time and money? My son turns 16 in 2 months and he has indefinite leave to remain through me but I still want him to have the British passport he's entitled to.