Shared lifetime of grandmothers and grandchildren significantly increased since 1800s

The importance of grandmothers in the lives of their grandchildren has changed. The shared lifetime between grandmothers and their grandchildren has a fundamental effect on how grandparents and grandchildren influence each other. A study conducted by biologists, based on Finnish parish registers, indicates that, in this agrarian society, the shared lifetime of grandchildren and their grandmothers was short.

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