The Ruling on Adopting a Foundling

Question:
A man found a small foundling girl, and she has lived with him until now. He included her in his dependents and gave her his name. What is the ruling on the relationship between the girl and him according to the Shari'ah? Does the naming of the girl with the family name continue? And should he inform the girl at the time of her marriage that he is not her real father?

Answer:
Yes, this is necessary. She is attributed to them because they are her awliya (close friends of Allah), they raised her, and they treated her well. However, she does not become his daughter. He attributes her to someone else, such as the daughter of Abdullah or the daughter of Abdul Rahman. All people are the servants of Allah: Abdullah, Abdul Rahman, Abdul Latif. He does not attribute her to himself, because if he attributes her to himself, people may think she is his daughter. Consequently, she would inherit alongside his children and become a mahram (a relative one may not marry) to them. This is not permissible; there is great danger in this.
As for his treating her well and raising her, he has a reward for that. But if she did not suckle from his wife, nor from his daughters, nor from his sisters, he is permitted to marry her; she is considered a stranger to him, and his sons are permitted to marry her. However, if his wife suckled her, because she was small before weaning, meaning his wife suckled her, then he becomes her father. Or if his daughter suckled her, he becomes her grandfather. Or if his sister suckled her, he becomes her maternal uncle.