Excessive reassurance seeking (ERS) is a maladaptive self-regulatory behavior whereby an individual persistently seeks reassurance that one is loveable and worthy (Joiner et al., 1992; Joiner et al., 1999). Despite research evidencing the negative consequences of ERS on relationships, little is known about how ERS presents across relationships. The present study evaluated the associations between mothers’ and daughters’ ERS across the parent–child relationship and across their respective romantic relationships. Sixty-seven mother–daughter dyads were recruited to separately complete measures of ERS in reference to their relationships with each other and their relationships with their romantic partners. Consistent with our hypotheses, mothers’ ERS directed toward their romantic partners correlated with mothers’ ERS directed toward their daughters, r(65) = .36, p = .003, and daughters’ ERS directed toward their mothers also correlated with daughters’ ERS directed toward daughters’ romantic partners, r(65) = .25, p = .04. These preliminary findings highlight the interpersonal nature of ERS and contribute to the understanding of the consistency of this maladaptive interpersonal behavior across relationships.