'She has a child for me but i have not seen him' What is your advice?

Osas ( not real name) a native of Edo state and Terdoo ( not real name) a native of Benue state were neighbours in the barracks were their parents both resides and attended the same school. They were in the same class and grew up together as friends, though from a distance because they were shy to relate with each other.
As they finished their SSCE, while waiting for their results and hoping to gain admission to the university they got into an intimate relationship of a long time nursed and unexpressed love for each other.
A year after Terdoo got pregnant for Osas which he accepted responsibility for because they were both virgins, he was her first and she was his first too. Osas's family accepted to allow their son get married to Terdoo but Terdoo's family refused with the excuse that they don't get married to strangers.
Since after she gave birth to male child, Osas has been denied seeing his son. Terdoo's mother prevented every form of contact between Osas and his son.
Its been over nine (9) years since Terdoo gave birth to a son for him and he has not seen him, he is confused and he seeks advice on what to do because Terdoo's mum does not allow Terdoo go out with the child.
Please send in your advice to Mr Osas.