The Prohibition of Marrying One's Father's Wife
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Question: A man married a woman who had a daughter at the time of their marriage, and he fathered children from her. Is it permissible for the man's son from another woman to marry the daughter of this woman whom his father married?
Answer: This person is asking about the ruling on marrying his father's wife's daughter, who is from another man? There is no harm in that, because there is no relationship between them in terms of kinship. She is a stranger to him, and he is a stranger to her. Therefore, it is permissible for a person to marry his father's wife's daughter from another man.
[The Prohibition of Marrying One's Father's Wife]
Question: What is the ruling on one who married his father's wife, knowing that she had children from him?
Answer: Allah the Exalted has forbidden the marriage of a father's wife,Allah the Exalted said: [Surat al-Nisa: 22], so whoever deems this permissible has committed disbelief and apostatized from the religion of Islam.
However, if he did it out of ignorance and did not deem it permissible, then he has committed a great error. This marriage is invalid, and it is obligatory to separate them immediately. It is also obligatory to be strict with him in this matter.
Answer: This person is asking about the ruling on marrying his father's wife's daughter, who is from another man? There is no harm in that, because there is no relationship between them in terms of kinship. She is a stranger to him, and he is a stranger to her. Therefore, it is permissible for a person to marry his father's wife's daughter from another man.
[The Prohibition of Marrying One's Father's Wife]
Question: What is the ruling on one who married his father's wife, knowing that she had children from him?
Answer: Allah the Exalted has forbidden the marriage of a father's wife,Allah the Exalted said:
And do not marry those [women] whom your fathers married, except what has already occurred. Indeed, it was an immorality and hateful [to Allah] and was evil as a way.
وَلَا تَنْكِحُوا مَا نَكَحَ آبَاؤُكُمْ مِنَ النِّسَاءِ إِلَّا مَا قَدْ سَلَفَ إِنَّهُ كَانَ فَاحِشَةً وَمَقْتًا وَسَاءَ سَبِيلًاHowever, if he did it out of ignorance and did not deem it permissible, then he has committed a great error. This marriage is invalid, and it is obligatory to separate them immediately. It is also obligatory to be strict with him in this matter.