He is not sure whether he breastfed from her grandmother – may he marry her?

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As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
I have a sister of ‘breast feeding’. She was breastfed by my mother for sure, but I am not sure if I was breastfed by her mother. Nor I know how many times she was fed. The question is about her elder sister who was not breastfed by my mother for sure. She has a daughter and we have agreed to get married. Is it permissible to marry this girl whether or not it was proven that I was breastfed with her younger aunt?.
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Answer:
Praise be to Allaah.

Firstly: 

The mahram relationship through breastfeeding cannot be proven unless there were five definite breastfeedings, because of the report narrated by Muslim (1452) from ‘Aa’ishah (may Allaah be pleased with her) who said: Among the things that were revealed of the Qur’aan was that ten definite breastfeedings make a person a mahram, then that was abrogated and replaced with five definite breastfeedings. 

Secondly: 

If there is doubt as to whether breastfeeding took place, or about the number of breastfeedings, then the mahram relationship cannot be proven. 

Ibn Qudaamah (may Allaah have mercy on him) said in al-Mughni (8/138): If there is doubt as to whether breastfeeding took place, or about the number of breastfeedings which make one a mahram, whether it was complete or not, then the mahram relationship cannot be proven, because the basic principle is that it does not exist, and what is certain cannot be altered because of doubt. End quote. 

Based on this, so long as you are not certain about the number of breastfeedings from the grandmother of the girl whom you want to marry, then the mahram relationship cannot be proven in the event of doubt, and the basic principle is that this girl is permissible for you. 

But if it is proven that you were breastfed (by the grandmother), then (the girl’s mother) is your sister, and you are a maternal uncle of this girl through breastfeeding, so she is not permissible for you. 

For the sister who was breastfed by your mother, if she was breastfed five times, then she is your sister and the sister of all your brothers, and her daughters are mahrams for you, because you are their maternal uncle through breastfeeding. 

And Allaah knows best.

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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