I think the other question, @popi, is the fathers obligations. If he has acknowledged paternity then (as noted by others) he could be obliged to care for the child, even if she does not live with him. However once the adoption process is completed, these rights and obligations are transferred to you. Somewhere during the process he will likely be required to provide in writing that he is OK with the child being adopted.
Where any dispute occurs the principle of 'best interests of the child' is supposed to override all else. This obliges courts, adoption authorities etc to make decisions and arrangements first on what is best for the child, even if it contravenes paternity or fairness.
Adoption in Kenya, and many other countries, has become a pretty involved process due to the challenges of child protection. You would be best advised to seek advise from a good lawyer.
"The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth." (Niels Bohr)