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I would argue it's after reproduction, successful reproduction that also has successful reproduction even.

Why do grandparents love their grandchildren? Something noble about human nature and love? Or is it evolutionary advantageous?

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From my own observations, the relationship retriggers the parenting motivations / dopamine. With the added benefit that you can put the darn thing down at the end of the day and walk away.

From my own observations, the relationship triggers nothing like parenting. There's no feeling of parental obligation, outside of love for that child. So, tell me, why would that evolve in people?

Because old cave-people aren't as good at hunting and gathering, and can be better used as child-care cavepeople.

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