Yes, I was right. If you get married that then gives him PR. From the government website:
Unmarried fathers can acquire parental responsibility for their children in several different ways, depending on when their children were born.
For children born before 1 December 2003, unmarried fathers can get parental responsibility by:
- marrying the mother of their child or by obtaining a parental responsibility order from the court
- registering a parental responsibility agreement with the court or by an application to court
For children born after 1 December 2003, the situation is different. Unmarried fathers can get parental responsibility by:
- registering the child's birth jointly with the mother at the time of birth - this is now quite common and many parents choose to do this
- re-registering the birth if you are the natural father
- marrying the mother of their child or by obtaining a parental responsibility order from the court
- registering with the court for parental responsibility