Q 1: What is the ruling on a person who was
breastfed with his female cousin and did not marry her, then each of them got married and was granted children, (Part No. 21; Page No. 66) and now they would like to marry their children to each other?
Is this permissible? Or are the children forbidden to each other in marriage as their parents were?
If the matter is exactly as what is mentioned in the question, it is permissible for your sons and daughters to marry any of the children of your female cousin. The fact that you and your female cousin were breastfed together has no influence on the marriage of your children to each other.
Is it forbidden for the elder brother of a foster brother and elder sister of a foster sister to marry each other?
If a baby boy or a baby girl breastfeed from one woman, he will be her foster son and a foster brother to all her old and young children. Accordingly, it is impermissible for any of the children of the wet nurse to marry the baby girl that was breastfed by her. It is worth mentioning that breastfeeding makes marriageable relatives become unmarriageable when it takes place five times or more during the first two years of the baby's age. One time of breast-feeding is that the baby holds the breast and sucks milk from it then releases it. When the baby sucks milk again, this will be counted as a second time of breastfeeding and so on.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.