This paper studies whether older siblings influence the study choices of younger siblings. I develop a simple theoretical model to separately identify spillover effects from shared preferences. I use Dutch random admission lotteries to medical school as a source of exogenous variation. I find that 70% of siblings’ common study choices are due to sibling spillovers, and the remaining 30% are due to common preferences. I argue that parental time and financial investment in children is likely the driving force of sibling spillovers.