What is the ruling on breastfeeding the children of one's maternal aunt to make them foster siblings, based on the advice of the Prophet, peace and blessings be upon him, to avoid marrying relatives and the hereditary diseases resulting therefrom, and to achieve harmony, taking into account the opposition of the parents for fear of preventing them from marrying in the future?

There is no harm in some of you suckling the children of others, to achieve brotherhood, mutual visitation, and cohesion, and to avoid future embarrassment, as they will become unmarriageable relatives through suckling. These are noble objectives. The question about the impact of suckling on future marriage is valid, but this does not prevent suckling, because the bond of brotherhood through suckling is strong and removes embarrassment if the children grow up together. Jurists recommend marrying outside the family for its health benefits, but marriage to relatives is permissible in Sharia. The Prophet, peace and blessings be upon him, married from his relatives and married his daughter to his cousin. What is raised about genetic diseases is not definitive.