Is it permissible to marry ones grandfathers step brothers daughter?

In the Name of Allah, the Most Gracious, the Most Merciful.

As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.

It is permissible for you to marry your maternal grandfathers step brothers daughter. Allah Ta’ala mentions in the Quran after mentioning all those females with whom marriage is not permissible (Muharramaat): [i]

وأُحِلَّ لَكُمْ مَا وَرَاءَ ذَلِكُمْ

And lawful to you are all others (females) beyond these (Muharramaat) 

And Allah Ta’āla Knows Best

Aboobakr Siddeeq bin Mufti Amjad Mohammad

Student Darul Iftaa 

Azaadville, JHB, South Africa 

Checked and Approved by,
Mufti Ebrahim Desai.