Ever since the publication of Scanlon’s Promises and Practices and What We Owe to Each Other, expectations have become an important topic within discussions on promises. However, confining the role of expectations to promises does not do justice to their importance in creating obligations more generally. This paper argues that expectations are one of the major sources of obligations created within our personal relationships. What we owe to our friends, partners, or siblings very often follows neither from the duties associated (...) with the given role, nor from our explicit promises, commitments, declarations, or consents. The obligations that our close relationships create often arise from a shared understanding of those relationships—and subsequent mutually acknowledged expectations. (shrink)