Fatwa ID: 03420
Answered by: Maulana Imran Mughal
It is an established rule in Fiqh that the foster father is not allowed to marry his foster daughter since he is the Sabab of his wife's breast milk. My question is, hypothetically, if the wife already had breast milk prior to marriage (due to abnormality, etc) would her husband still be considered the foster father (as he wasn't the Sabab for the milk)?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allah, the Most Gracious, the Most Merciful
If the foster father has consummated the marriage, then he will be considered her foster father. Such that if he divorces his wife before consummating the marriage it will be permissible for him to marry the breastfed child, as she was not breastfed from milk for which he was the sabab.
Only Allah SWT knows best
Written by Maulana Imran Mughal
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
Ibn Abideen, Radul Muhtaar Ala Ad-Duri lMukhtaar (Daar Aalamil Kutub) Volume 4 Pg 411.