How is the distribution calculated when three brothers, sharing parentage differently (full-blood, half-blood by father, half-blood by mother), drown, and each leaves a full-blood sister?

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The calculation proceeds sequentially based on presumed order of death for each brother, with complex fraction multiplication based on the distribution of each brother's estate among his sister (full-blood), full-blood brothers, paternal half-brothers, and maternal half-brothers. For instance, the presumed first death results in the maternal half-brother's share being divided between the full-blood sister and the maternal half-sister, and the paternal half-brother's share being divided between the full-blood brother and the paternal half-sister. These fractions are then multiplied across subsequent stages of presumed death to arrive at the final division over a large base number such as seventy-two.