Helpful grandmothers in rural Ethiopia: A study of the effect of kin on child survival and growth

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Hamilton's rule and kin competition: the Kipsigis case ☆ (2007, background): “This is opposite to the Ethiopian pattern where child survival is enhanced by the presence of unspecified maternal kin in the village (Gibson & Mace 2005).”
Who keeps children alive? A review of the effects of kin on child survival (2008, methodology): “…of the studies in this review have only used correlational evidence to infer helping behaviour from kin, but Gibson & Mace (2005) also collected time budget data to establish what relatives were actually doing for one another.”