“…For instance, family members and romantic partners' messages tend to hurt more than those from friends (Vangelisti & Crumley, 1998), whereas message type does not differentiate degree of hurt in sibling relationships (Myers & Bryant, 2008), probably because sib-lings have such strong relational histories and confirmed expectations for indestructible bonds. In this way, siblings are far different from in-laws whose lack of a (long) shared family history, and corresponding ambiguity in regard to rules and expectations (Fischer, 1983), are more likely to lead them to differentiate between the types of messages that elicit varying amounts of hurt.…”