Son marrying his father’s stepdaughter

Dear Brothers & Sisters,
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:
Is it haram to marry my step-sister who was raised by my biological father and step-mother i feel kind of odd in this situation,considering my father and stepmom already have a child ,would this confuse the lineage if her and i were to get married and have a child too? and Sheik do we find this practice in the way of our Salaf ul sali?.
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Praise be to Allaah.

The daughter of your father’s wife is known as your father’s stepdaughter, and she is a mahram for your father only, if he has consummated the marriage with her mother, whether he brought her up himself or she is an adult and he did not bring her up. This is the view of the majority of the earlier and later scholars, and is the view of the four imams. When mentioning the women who are mahrams for men, Allaah says (interpretation of the meaning): 

“Forbidden to you (for marriage) are: your mothers, your daughters, your sisters, your father’s sisters, your mother’s sisters, your brother’s daughters, your sister’s daughters, your foster mothers who gave you suck, your foster milk suckling sisters, your wives’ mothers, your stepdaughters under your guardianship, born of your wives to whom you have gone in — but there is no sin on you if you have not gone in them (to marry their daughters), — the wives of your sons who (spring) from your own loins, and two sisters in wedlock at the same time, except for what has already passed; verily, Allaah is Oft-Forgiving, Most Merciful”

[al-Nisa’ 4:23]

But with regard to you, this stepdaughter is not a mahram for the son of her mother’s husband, so it is permissible for you to marry her, and there is no problem in that.  

The Standing Committee was asked about marrying the daughter of the father’s wife. They replied: 

It is permissible for the son of the man mentioned to marry the daughter of the woman mentioned, even if his father is married to her mother. Allaah says (interpretation of the meaning): 

“All others are lawful”

[al-Nisa’ 4:24]

The girl mentioned is not one of the mahrams listed in this verse, or in the Sunnah. 

Al-Fataawa al-Jaami’ah li’l-Mar’ah al-Muslimah, 2/600 

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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