We document the educational integration of immigrant children in France and Germany with a focus on the link between family size and educational decisions and distinguishing particularly between first- and second-generation immigrants and between source country groups. First, for immigrant adolescents, we show family-size adjusted convergence to almost native levels of higher education track attendance from the first to the second generation of immigrants. Second, we find that reduced fertility is associated with higher educational outcomes for immigrant children, possibly through a quantity-quality trade-off. Third, we show that between one third and the complete difference in family-size adjusted educational outcomes between immigrants from different source countries or immigrant generations can be explained by parental background. This latter holds true for various immigrant groups in both France and Germany, two major European economies with distinct immigration histories.