Your marriage to the mother of the girl whom you had previously married but divorced before consummating the marriage is invalid. It is impermissible for a man to
marry his mother-in-law, as long as he has concluded a marriage contract with her daughter, even if he did not consummate his marriage to her. Allah (Exalted be He) says,
Forbidden to you (for marriage) are: your mothers, your daughters
until His saying,
...your wives’ mothers
(Part No. 18; Page No. 220) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.