A man married a woman but they did not have children and he divorced her. She married another man and bore him a son. Then, she married a third man and bore him sons and daughters. Is it permissible for him to marry her?
If you are asking about the ruling on remarrying the woman whom you were previously married to, it is permissible as long as she is not (Part No. 18; Page No. 216) married to another man or in the time of `Iddah (woman's prescribed waiting period after divorce or widowhood). If you want to marry one of her daughters from her third husband, it is impermissible for you, as they are your stepdaughters. Allah (Exalted be He) says,
Forbidden to you (for marriage) are: your mothers, your daughters
until He says,
...your step daughters under your guardianship, born of your wives to whom you have gone in
You have married their mother and consummated your marriage to her, so it impermissible for you to marry one of her daughters, even if you had not brought them up. This condition is general, and is not restricted to a particular case. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.