The answer is No,
Because the cost of my death is higher than the fitness gains from saving my kin.
The cost of fitness of 5 cousins and one half-sister is 87.5 (12.5 *(5) for cousin and 25 for half-sister) that is less than your cost which is 100. So there is no benefit of saving your cousins and half-sister while putting your life in danger.
What is cost of fitness ?
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