Qur'anic verses - Case 2:

A man died leaving a wife, a son, a duaghter, a mother, 4 brothers and 2 sisters:

(Note: the brothers and sisters do not inherit in the presence of sons)

(1) The inheritance is divided into equal shares:

no. of shares, say = 24 x (2 x S + D)

(where, S = no. of sons; D = no. of daughters)

in this case,
24 x (2 x 1 + 1) = 72 shares

(2) The mother, according to verse (4:11), inherits one sixth of the whole inheritance:

mother's shares = 1/6 x 72 = 12

(3) The wife, according to verse (4:12), inherits one eighth of the whole inheritance:

wife's shares = 1/8 x 72 = 9

But if ye leave a child, They get an eighth.
[Qur'an 4:12]

(4) The remaining inheritance is divided between the children in accordance with verse (4:11), such that the male takes twice the share of a female:

(remaining = 72 - 12 - 9 = 51 shares)

daughter = 51 / (2 x S + D) = 51 / 3 = 17 shares

son = 17 x 2 = 34 shares