Praise be to Allah.
There is nothing wrong with that, because there is no connection of blood between them, so she is a stranger (non-mahram) to him, and he is a stranger to her. So it is permissible for a person to marry the daughter of his father’s wife from another man, because Allaah says, after mentioning those to whom marriage is forbidden: “All others are lawful” [al-Nisa’ 4:24].
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