<human>: Trying to figure out a situation for a friend. Here's what I understand.

8 years ago his girlfriend, J, had a son. At the end of the pregnancy she suddenly left, made accusations of abuse, and he never heard from her again. Over the years he has tried to serve her with papers to get the matter into court but she simply cannot be found in order to serve her.

He's just recently heard that she has recently (as in within the past year) left the boy with her mother. I do not know if the biological mom is still involved with the child's life. She is now pursuing a career in the adult film industry. The father was not consulted on this change of guardianship, and I do not believe that any legal documentation has passed hands in this matter.

Is there ANYTHING my friend can do? He just wants to be a father to his son. He has since gone on to have another child, a girl, who he went to court for custody over and won.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Friend's ex left with daughter 8 years ago. Has since left kid with grandmother, without offering custody to the father. What can he do?