I have a sister through breastfeeding, and this sister has a full brother. This brother has a daughter. Is it permissible for me to marry his daughter?

The questioner : I have, for example, a sister through breastfeeding. This sister has a full brother. This brother has a daughter. Is it permissible for me to marry his daughter?

The Shaykh : The sister of this brother, what would you be to her? What did you say?

The questioner : A sister through breastfeeding.

The Shaykh : You would be the sister of this brother through breastfeeding, meaning you were breastfed by the mother of the brother and the sister, is that right? You were breastfed by the mother of the brother and the sister? The father of the brother, the one you call the brother of the girl.

The questioner : His full brother.

The Shaykh : Full brother of whom?

The questioner : Full brother of the girl.

The Shaykh : That is it, meaning this full brother and that sister have the same mother, is that not so?

The questioner: Yes.

The Shaykh : So you were breastfed with whom? With the full brother? Yes.

The questioner: Yes.

The Shaykh : With the girl, were you breastfed?

The questioner: Yes.

The Shaykh : The breastfeeding is shared here, meaning it is one milk, so it is not permissible for you to take her, for she is your sister through breastfeeding.

The questioner : So it is not permissible for me to marry the brother's daughter? I have a sister through breastfeeding, and this sister has a full brother, and this brother has a daughter. I want to marry this girl?

The Shaykh : The brother has a daughter?

The questioner : The brother has a daughter, so is it permissible for me to marry this girl?
Abu Layla : The best way is to write it down, Fatima, and mean it by the names.

The Shaykh : I mean, as we do there, write the picture exactly so we can study it. Please.