Hadith.4490 - Safwan ibn Yahya narrated from Zayd ibn al-Jahm al-Hilali, who said
I asked Abu Abdillah (as) about a man who marries a woman, and she has a daughter from another man. Can he marry his son to her daughter?
Imam (as) said: "If the daughter is from a husband she had before he married her, then there is no harm. But if the daughter is from a husband she had after he married her, then no, it is not permissible."