Having seen the picture of the father, I have a number of doubts. Nine months after the event, he has no facial changes to imply anything approaching sexual maturity. How could his testosterone levels be high enough to release sperm if not high enough even to cause acne? No bone changes, no facial hair. Is he the father? Isn't it odd for a 14 year old girl to feel attracted to someone two years her junior. As I recall, it's two years older that draws the attention.
They both come from large families which seem on the feckless side. This isn't a society wide problem. There are a few families where children may seek comfort in early sexual behaviour.
I have seen boys who early in their teens do look physically mature - I've seen one at 9 who had me suspecting that the body builders he hung out with had been feeding him steroids. His muscles and body shape, and taut face looked older, but he had no body hair or other development. This lad shows none of that sort of thing. I have doubts.
Penny