بسم الله الرحمن الرحيم
(Fatwa: 702/674/SN=07/1437)
If your grandfather and grandmother died prior to your father then as per the question mentioned above whatsoever property (land, house, cash, jewellery and other assets) they have left it shall be divided among 48 shares, after paying due rights preceding inheritance. Out of the total your mother shall get 6 shares, while each brother shall get 14-14 shares and each of your sister shall get 7-7 shares. The detail of Shariah division is as follows:
Details:
Wife: 1×06 = 06
Sons: 2×14 = 28
Daughters: 2×07 = 14
Total: 48 Shares
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband