What is the ruling if the number of sisters/brothers increases beyond the initial assumption resulting in a larger remainder?

Primary text

If the remaining shares are increased beyond the initial division (such as when more siblings are present), the grandfather is allotted the fixed share of one-sixth (Al-Suds). The matter then shifts such that the total shares are computed based on a denominator of twenty-four (Arba'ah wa 'Ishrun), and the shares are subsequently resolved based on the lowest common denominator of those inheriting.