Opposite effects of maternal and paternal grandmothers on infant survival in historical Krummhörn

By E. Voland, J. Beise. Behavioral Ecology and Sociobiology, 2001

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The Evolution of Cognitive Bias (2015, background): “However, there is evidence that women in traditional societies can enhance their inclusive fitness by transferring investment to their daughters’ daughters as soon as the latter are of reproductive age (Voland & Beise, 2002).”
Grandchild care and welfare state arrangements in Europe (2011, background): “…the strong link between daughters and grandmothers is explained by the so-called grandmother hypothesis (Hawkes and Blurton Jones, 2005; Voland and Beise, 2002): Grandmothers are generally too old to pass on their genes through reproduction and focus instead on the survival of their…”
2. Evolutionary context of human development: the cooperative breeding model (2005, background): “Well documented cases come from African hunter-gatherers; West African horticulturalists (Sear et al. 2002), 18 th century German peasants ( Voland and Beise 2002 ) and ricegrowing peasants in 19 th century Tokugawa Japan (Jamison et al. 2002).”
Who keeps children alive? A review of the effects of kin on child survival (2008, background): “There also appear to be differences in the kinds of help offered by maternal and paternal kin in their helping behaviour (and not only in the frequency with which they offer help: Beise, 2005; Gibson & Mace, 2005).”