Although there seems to be a consensus among Croatian and international education theorists alike when it comes to the issue of values being an integral part of upbringing almost to the same extent as upbringing is considered a part of education, discord ensues as soon as implementation of specific values is attempted through official curricula. There is discord when it comes to specific values, but also when teaching methods are concerned. In this paper, we will argue that this issue could be resolved by applying Rawls's theory of justice to the prevalent practices in upbringing and education, with some minor adjustments. We argue that, since the political and familial domains share three crucial characteristics, it is legitimate to expand the application of the public reason as the main principle of political domain, so as to govern both parental and educational conduct, which could in turn result in considerable changes in the ways upbringing is traditionally viewed. By analysing the main principles of Rawls's liberal theory of justice, and applying these to parental practices at home, as well as to institutionalized educational conduct by the teachers at schools, we will try to offer an outlook on the proper educational and parental conduct from the liberal perspective. In the final chapter, we will defend the idea of cosmopolitanism as the right way to go at the crossroads of deciding on the appropriate educational policies in the liberal, democratic, constitutional regimes, the kind that most of the contemporary (Western) societies, declaratively, strive to be, but often seem to fail in this endeavour. This is confirmed in the light of numerous crises we are faced with lately.