According to a research by Rachel Pruchno, emotional empathy was the main driver behind grandparents decision to start caring for their grandkids.
Grandparents are the paternal or maternal parents of an individual. Every sexually reproducing living being that is not a genetic chimera has a maximum of four genetic grandparents, eight genetic great-grandparents, sixteen genetic great-great-grandparents, thirty-two genetic great-great-great-grandparents, etc.
Around 30,000 years ago in the history of modern humanity, there were an increasing number of people who survived to be grandparents. Although the exact cause of this increase in longevity is unknown, it is generally accepted that one important result of three generations coexisting was the preservation of knowledge that might have otherwise been lost. This preservation of knowledge was made possible in large part by advancements in medical technology and living standards.
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