Marrying the maternal cousin and the father marrying her mother

Q: My father married the widow of my maternal uncle who was my mother's full brother. This woman is also the daughter of my father's paternal uncle. She had two daughters from her ex-husband who was my maternal uncle. I married one of her daughters with the permission of her Waliy (a legally accountable person acting for a woman regarding marriage) who is her grandfather and my maternal grandfather. The widow of my maternal uncle who married my father gave birth to three boys and two girls. They are all my brothers and sisters and at the same time are my wife's brothers and sisters. I married my wife after her mother gave birth to those children. I am doubtful about the permissibility of this marriage. What is the ruling on this case?

A: If the reality is as you mentioned, your father's marriage to the widow of your maternal uncle is permissible if he married her after the end of her `Iddah (woman's prescribed waiting period after divorce or widowhood). Moreover, your marriage to the daughter of your maternal uncle is permissible even if your father married the mother of this woman after that. This is because the basic rule is permissibility as long as there is no proof that prohibits that. The children of this woman who married your father are your paternal half brothers and her children from her ex-husband are maternal half brothers to your paternal half brothers. None of these things affect the permissibility of your marriage. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.