Is it permissible for a girl who was adopted by a man to continue living with him after she learns that he is not her biological father?

Adoption is Islamically forbidden, and it does not alter the fact that the adopted child is not the daughter of the adopter, according to the Almighty’s saying: "Call them by [the names of] their fathers; that is more just in the sight of Allah." It is permissible for the adopted child to live with the one who adopted her, provided that she stays in a separate part of the house and treats him as a stranger. Thus, he should not be alone with her, nor should she remove her head covering in front of him, unless the adopter is among "men who have no sexual desire."