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timtyler comments on Problems in evolutionary psychology - Less Wrong
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One example I found was an experiment to test the variations in resource expenditure for different grandparents. Dekay (1995). The evolutionary model they used precisely predicted the pattern of resource expenditure. Maternal grandmothers contributed most, followed by maternal grandfathers, followed by paternal grandmothers followed by paternal grandfathers.
You make it seem like this is an exception to the rule. Reading through an ev. psych textbook, I am constantly surprised by the clever experiments I never would have thought of to test evolutionarily based predictions. The predictions themselves are impressive.
One example I found was an experiment to test the variations in resource expenditure for different grandparents. Dekay (1995). The evolutionary model they used precisely predicted the pattern of resource expenditure. Maternal grandmothers contributed most, followed by maternal grandfathers, followed by paternal grandmothers followed by paternal grandfathers.
Edit: Apparently I like to repeat myself. : )
Some starting points
"Grandparental investment as a function of relational uncertainty and emotional closeness with parents"
"Differential Investment Behavior between Grandparents and Grandchildren: The Role of Paternity Uncertainty"
"An Evolutionary Perspective on Parental and Grandparental Investment (2010)"
"LINEAGE BASED DIFFERENCES IN GRANDPARENTAL INVESTMENT: EVIDENCE FROM A LARGE BRITISH COHORT STUDY"