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In this paper, we examine how children care for their elderly parents and the motives of these family transfers, accounting for interactions between parents and their different children. We study a theoretical model of intergenerational transfers based on altruism, where siblings care for their parents (a public good). Decisions of upstream assistance are analysed using data from a trigenerational survey. Econometric results, which control for unobserved heterogeneity within families using fixed effects, show that time-related transfers to elders mainly depend on the parental needs and the children’s availability. Transfer behaviors from children are rather independent from each other: there does not exist any positive or negative competition within siblings when caring for elderly.Classification JEL: D1, D64, J14