Source: Fatāwā Amunpuri by Shaykh Ghulam Mustafa Zaheer Amunpuri
❖ Question:
What is the ruling on marrying a wife’s paternal half-sister (i.e., same father, different mothers)?
✿ Answer:
It is not permissible to marry one’s wife’s paternal half-sister while the wife is still in the marriage.
This too falls under the prohibition of combining two sisters in one marriage.
Such a marriage is not allowed in Islam.
Allah ﷻ says:
﴿ وَأَنْ تَجْمَعُوا بَيْنَ الْأُخْتَيْنِ ﴾
📚 [Sūrat al-Nisā’: 23]
“And (also forbidden is) that you combine two sisters (in marriage at the same time).”
The word “sisters” here includes all types of sisters — whether they share the same father (paternal sisters), the same mother (maternal sisters), or are full sisters (same mother and father).
✔ Summary:
① It is forbidden to be married to a woman and her half-sister (same father) at the same time.
② The ruling applies to all categories of sisters.
③ Such a marriage is haram and not valid in Shari’ah.
