بسم الله الرحمن الرحيم
(Fatwa: 956/769/D=09/1436)
If those who want to sell the house are the sole heirs of the house then the amount shall be divided into four shares out of which the brother shall get 2 shares while 1-1 share shall go to each sister.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
