Is it permissible for a man to marry his maternal uncle's wife?
(Part No. 18; Page No. 333) What is meant by the phrase:
...your mother’s sisters
Yes, it is permissible for a man to marry his maternal uncle’s wife after the uncle divorces her or dies, and the ‘Iddah (woman’s prescribed waiting period after divorce or widowhood) is completed. This is based on the evidence mentioned in the answer to the first question. A maternal aunt is the mother’s sister, whether she is a full or a half-sister from either the mother or the father. This is the meaning of maternal aunt in the Noble Qur’an. This is the meaning indicated in this Ayah (verse) from the Qur’an. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family, and Companions.