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Re:Forget Survival of the Fittest: It Is Kindness That Count... by flomble on Tuesday January 03, 2017 @03:56AM (#13307823)
Because your brother shares around 50% of your genes. Helping your brother reproduce therefore helps to propagate some of your genes.

The principle behind this is that evolution operates at the level of genes, rather than individuals. I recommend Richard Dawkins' The Selfish Gene for a fuller explanation.

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