Following contains the summary of the law of Inheritance under heading “5. Distribution of Inheritance:“
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Summary can also be found at the start of the following thread:
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In the absence of children, siblings become the end beneficiary of the remaining inheritance after it has been distributed to parents and spouse(s). As for the departed siblings, their share will be calculated accordingly in ratio of 1:2, with a brother getting twice the share as that of a sister, and their share will then be distributed among children of departed siblings in the same 1:2 w.r.t male and female children of the departed siblings. In addition to response by Hassan Sahab shared by Ahsan Sahab above, please also refer to the following resposne by Irfan Shahzad Sahab:
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Will in favor of Kalala is optional, and if children are present, then will can be made in favour of siblings in their capacity as Kalala (becasue here they are not the part of primary distribution hierarchy in the presence of children). And if will is made in favour of Kalala, then sharia regarding that distribution should be followed: If the relative who is made an heir has one brother or one sister then he or she shall be given a sixth of his share and he himself shall receive the remaining five sixth. However, if he has more than one brother and sister then they shall be given a third of his share and he himself shall receive the remaining two thirds.