If a man has a sister 
 through breastfeeding, who was breastfed by his mother, or was breastfed 
 along with him by another woman, he may marry her sister, because the mahram 
 relationship here is limited only to the one who was breastfed, and not her 
 sisters.&nbsp;
But if he was breastfed by 
 the mother of the girl, then he is a brother to the girl and to all her 
 sisters, so it is not permissible for him to marry any of them.&nbsp;
And Allaah knows best.

Women Who are Forbidden for Marriage

Islam Q&A

Ruling on marriage to the sister of a person with whom he was breastfed

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