What is the method for calculating the core denominator (Asl) in inheritance problems involving return (Radd)?
Chapter on the Roots of Inheritance Shares that Increase (Awl)
Al-Mughni
Book of Inheritance Shares (Farā'id)
Primary text
The method for calculating the return involves taking the shares of the heirs eligible for return from their core problem, which always stems from six, as the only fractions not divisible by six in the fixed shares are the quarter and the eighth, which are not taken by the spouse or spouse. The number of their shares becomes the core problem for calculation. This process is generally limited to five fundamental core denominators: two (e.g., a grandmother and a uterine brother, each with one-sixth); three (e.g., a mother and a uterine brother, or a mother and two uterine brothers); four; five (e.g., the case mentioned involving a full sister, a consanguineal sister, and a uterine sister); and specific scenarios involving combinations of daughters, granddaughter shares, and grandmothers. The return issues do not generally exceed these established core denominators because if the required share increased, the estate would be fully distributed, leaving nothing to return.