What is the distribution when a mother, a full sister, two brothers by father only, a sister by father only, and a grandfather are present?

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The original resolution is from six parts, which transitions to eighteen parts. This leaves one extra share for the children of the father over five shares, multiplying this by eighteen results in ninety parts. This calculation is termed the 'Tis'iniyya Zayd' (Zayd's Ninetieth).