Is the marriage of Muhammad and Amal permissible, given that they were both suckled by their aunt Fatima, but the "milk of the fahl" for each of them is different?

Prohibition through breastfeeding occurs when two individuals are breastfed from the same woman's breast. It is necessary for the breastfeeding to consist of five full, satisfying breastfeeds or more. So, if Muhammad and Amal were breastfed by Fatima for five full, satisfying breastfeeds, they become siblings through breastfeeding, and their marriage is invalid and must be dissolved immediately. The children, however, are attributed to the husband due to his belief in the validity of the marriage. But if the breastfeeding was less than five feeds, the prohibition is not established, and the marriage remains valid.