The shares and percentages of wealth distribution between the heirs is based on clear formulas. There are so many combinations of families that each cannot be stated. However some primary principles are that the sons get double the share of the daughters hence the ratio of inheritance is 2:1. The wife gets 1/8th share from her husband’s estate.
Source: HEIRS ACCORDING TO SHARIAH – Principles of Succession | Hassan Elhais – JDSupra