A University of Turku study reveals that support from maternal grandmothers can significantly enhance the well-being of grandchildren facing adversities, with effects persisting into adulthood. This support, ranging from childcare to financial assistance, mitigates emotional and behavioral issues stemming from adverse childhood experiences. Unlike support from other grandparents, maternal grandmothers' involvement yields notable benefits. Evolutionary biology underscores the significance of grandparental investment, yet further research is needed to fully grasp its impact on grandchildren's development.