Drawing on a panel study of parents and children, we investigate linkages between parents' marital quality and adult children's attitudes toward a range of family issues, including premarital sex, cohabitation, lifelong singlehood, and divorce. We hypothesize that parents' marital quality will be negatively related to children's support for these behaviors in adulthood and that parents' marital quality will condition the intergenerational transmission of attitudes toward these issues. We find some evidence that parents' marital quality influences children's support for divorce and premarital sex. More important, our analyses show that parents' marital quality facilitates the intergenerational transmission of attitudes. Parents' attitudes toward premarital sex, cohabitation, and being single are more strongly linked to those same attitudes among their young adult children when parents' marital quality is high than when it is low.Historically, marriage in the United States constituted a unified set of ideas about appropriate adult behavior. Marriage conferred adult status and set the boundaries for sexual activity, childbearing, and living arrangements with a sexual partner. Marriage defined the kinds of work performed by husbands and wives and was viewed as a lifelong endeavor. In recent decades, however, marriage has been largely deinstitutionalized; its meaning is no longer broadly shared, and the package of behaviors that were associated with marriage in the past have become much less closely linked (Cherlin 2004). Behaviors such as premarital sex, cohabitation, childbearing outside of marriage, extended singlehood, and divorce have become much more common in recent years, and they have also become more widely accepted (Thornton and Young-DeMarco 2001). The goal of this article is to investigate the ways in which parents' marriages shape children's attitudes about behaviors that conflict with historical definitions of marriage. Understanding the factors influencing attitudes about marriage and family life is important in part because these attitudes have been linked with behaviors such as premarital sex, cohabitation, and divorce (Axinn and Thornton 1992Thornton , 1993Bumpass 2002). We expect that the quality of marital relationships observed by the children of married parents will shape children's attitudes toward the behaviors that have historically been associated with marriage. We also hypothesize that parents' marital quality will condition the intergenerational transmission of attitudes about marriage and its alternatives.