If one asks people which of their four grandparents provided the most care for them when they were a child or to which grandparent they feel closest, the most people will answer the maternal grandmother.
Indeed, many research studies found that the intensity of caregiving by the four grandparents is not the same but regularly different. In most urban societies, grandmothers typically invest more in grandchildren than grandfathers, and maternal grandparents invest typically more than paternal. Thus, grandparental caregiving (i.e., their grandchild care, investment of resources, solicitude, involvement, and contact frequency) follows the asymmetric pattern: maternal grandmother provides on average the most caregiving for grandchildren, followed by the maternal grandfather and the paternal grandmother, and the paternal grandfather provides the least caregiving (Smith 1988; Euler and Weitzel 1996; Salmon 1999; Pashos 2000; Pashos and McBurney 2008; Danielsbacka et al. 2011; Pashos et al. 2016...
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Pashos, A. (2017). Importance of Maternal Grandmother. In: Shackelford, T., Weekes-Shackelford, V. (eds) Encyclopedia of Evolutionary Psychological Science. Springer, Cham. https://doi.org/10.1007/978-3-319-16999-6_1192-1
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