Dear Alamsherkhan, please read atleast my post and family tree given in this regard; with care. I did not write that Qutab Haider's wife was Ghaznavi Sister and Alaptigin's Daughter. It was Salar sahu, who was married to Mahmood Ghaznavi Sister and Subuktagin's Daughter, not Alaptigin's Daughter. I request you to please read the book, the biography of Ghazi Saiyyad Salar Masud on the instruction of Emperor Jahangir. Salar Masud was born at Ajmer on 22 January 1015 AD. He was son of Gazi Saiyyed Salar Sahu who was married to Sitr-i-Mu'alla, a sister Mahmood Ghaznvi. Ghazi Salar Sahu was brother of Qutb shah, and both were sons of Ghazi Attah Allah Ghazi. 

 Cheers