Ruling on a man marrying his sister’s sister through breastfeeding
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I also heard this hadith from another man before, that it is permissible for a man to marry his sister’s sister through breastfeeding, except for the one who was breastfed with him?
Answer: This is ambiguous. If the questioner or the speaker means that if a woman breastfeeds a person along with her daughter, he becomes a brother only to the one who was breastfed with him, and not to her other sisters before or after her, then this is an error. Rather, breastfeeding encompasses all the daughters of the nursing mother, those before the one breastfed with him and those after her, with no difference in that. So if she breastfeeds Zaynab, Salih, or Muhammad five times or more, he becomes a brother to all her children, male and female, those before him and those after him, by the explicit statement of Allah the Exalted: [Surat al-Nisa: 23]. She is his mother, and they are his sisters. And his statement (peace and blessings be upon him): Sunan Ibn Majah 1937Sahih (Darussalam).
As for if the speaker means that it is not forbidden for him except his sister who was breastfed with him, in another issue, such as it being said: So-and-so was breastfed by his mother along with him, and her sisters were not breastfed, this is correct. For example: Abdullah has five daughters, and one of them was breastfed with Muhammad by Muhammad’s mother. Then her remaining sisters do not become sisters to Muhammad, because they were not breastfed by his mother; only one of them was breastfed by his mother. The one who was breastfed by Muhammad’s mother five times or more during the two-year period is the one who becomes Muhammad’s sister, and her sisters do not, because they were not breastfed by Muhammad’s mother. However, if he was breastfed by their mother, he becomes a brother to all of them, not just the one who was breastfed with him. No. Rather, he becomes a brother to all of them, because the nursing mother became his mother, and all her children became his brothers. It is necessary to distinguish between this and that. Yes.
Answer: This is ambiguous. If the questioner or the speaker means that if a woman breastfeeds a person along with her daughter, he becomes a brother only to the one who was breastfed with him, and not to her other sisters before or after her, then this is an error. Rather, breastfeeding encompasses all the daughters of the nursing mother, those before the one breastfed with him and those after her, with no difference in that. So if she breastfeeds Zaynab, Salih, or Muhammad five times or more, he becomes a brother to all her children, male and female, those before him and those after him, by the explicit statement of Allah the Exalted:
your sisters through nursing
وَأَخَوَاتُكُمْ مِنَ الرَّضَاعَةِBreast-feeding makes unlawful (for marriages) the same things that blood tie make unlawful.
يحرم من الرضاع ما يحرم من النسبAs for if the speaker means that it is not forbidden for him except his sister who was breastfed with him, in another issue, such as it being said: So-and-so was breastfed by his mother along with him, and her sisters were not breastfed, this is correct. For example: Abdullah has five daughters, and one of them was breastfed with Muhammad by Muhammad’s mother. Then her remaining sisters do not become sisters to Muhammad, because they were not breastfed by his mother; only one of them was breastfed by his mother. The one who was breastfed by Muhammad’s mother five times or more during the two-year period is the one who becomes Muhammad’s sister, and her sisters do not, because they were not breastfed by Muhammad’s mother. However, if he was breastfed by their mother, he becomes a brother to all of them, not just the one who was breastfed with him. No. Rather, he becomes a brother to all of them, because the nursing mother became his mother, and all her children became his brothers. It is necessary to distinguish between this and that. Yes.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.