While most moral philosophers concentrate on questions that arise in the public sphere, the majority of people will be confronted with moral questions in their private lives, more particularly regarding their conduct towards the people they love. On a daily basis we make moral choices in the way we react to our friends' favours, our lovers' expectations, our children's needs, our parents' wishes. Yet some moral philosophers think that love in general, and family love in particular, falls outside the moral domain, and is governed by its own rules. They reject moral evaluations of love (as a motive or as an attitude) as overly moralistic. This project starts from the hypothesis that morality does have a bearing on love, and examines the objections against two theses: that it can be true of someone that he has a duty to love a particular person, and that once people love each other, their love can be better or worse in moral regard. After examining the theoretical and conceptual problems that affect the idea of a duty to love and the idea of a morally defect love, the results will be applied to parental love and filial love. Ought parents not only to take care of their children but also to love them? Can they do so in better or worse ways, and can these qualitative differences be spelled out in moral terms? Can they demand that their children love them back? The aspired formulation of an ethics of parental and filial love will fill a lacuna in contemporary moral philosophy, and will address moral questions of interest to a wide public insofar as they are at the heart of family life.