His Wife Was Breast-fed by His Father's Wife

Question :

I contracted the marriage of my daughter to my brother's son. Then after the marriage contract was made, we were assured by the wife of the married boy's father that she had breast-fed the married girl for five days. It is certain and most correct that it took place four days in succession, bearing in mind that the breast-feeding woman is not the married boy's mother, she is his father's wife. So is the girl permissible for this boy?

Answer:

If the girl who is contracted to marry him was breast-fed by his father's wife, from his milk (i.e. the milk which is attributed to him), and the breast-feeding took place five times. during the first two years of life, then this girl will be a sister to him through breast-feeding. Therefore, it is not permissible for him to marry her, according to the Words of Allah, Most High:
"Forbidden to you (for marriage) are: your mothers."

Up to His Words:
"your foster milk suckling sisters."

And according to the words of 'A'ishah, may Allah be pleased with her, who said: "It was revealed in the Qur'an that ten known breast-feedings caused prohibition, then it was abro- gated by five known breast-feedings. Then the Prophet ﷺ died and the matter remained thus."

And the Words of Allah, Most High:
"The mothers should suckle their children for two whole years, (that is) for those (parents) who desire to complete the term of suckling."

And the saying of the Prophet ﷺ :
"Nothing is forbidden due to breast-feeding except that which reaches the intestines and occurs before weaning."

At-Tirmizi said that it is Hasan-Sahih.

Breast-feeding is when the child sucks milk from the breast, then he leaves it in order to take breath or to transfer to the other breast etc. This is one breast-feeding, and if he returns to it, even soon afterwards, then that is two breast-feedings, and so on.

May peace and blessings be upon our Prophet, Muhammad and upon his family and Companions.