What is the ruling regarding a woman marrying her paternal aunt's son for 15 years, during which they had 4 children, if she discovers that he was breastfed by both of her grandmothers (her maternal and paternal grandmothers) when he was an infant? Does he then become her paternal uncle, and what should they do, especially since he is currently ill?

If a man's suckling from his grandmother (his mother's mother) is proven, then he becomes a brother to his maternal uncles and maternal aunts through suckling, and consequently, it becomes impermissible for him to marry their daughters. Based on this, the man would have become the paternal uncle of his wife, and separation between them is obligatory. Their children born before knowledge of the suckling are attributed to their father and are his lineage.