Answer:
(Fatwa: 252/L=166/TL=1433)
After committing adultery with the mother, her daughter becomes haram for adulterer forever. Hence if Zaid committed adultery with the mother of that girl then now it shall be haram for Zaid to marry that girl.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
