If the direct fitness cost to a donor is 6 and the indirect fitness benefit to the recipient is 30, is altruistic behaviour likely to evolve between cousins? Is the altruistic behaviour likely to evolve between full siblings?

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The Answer of If the direct fitness cost to a donor is 6 and the indirect fitness benefit to the recipient is 30, is altruistic behaviour likely to evolve between cousins? Is the altruistic behaviour likely to evolve between full siblings?

If the Direct Fitness Cost to a Donor Is 6