AbstractObjectiveThe current study examined the roles of parental differentiation, self‐differentiation, and attachment style and history in parenting twins.BackgroundRaising twins is a complex parental experience. One of the major roles of parenting twins is to ensure their parallel development, as well as their psychological differentiation and self‐individuation.MethodThe study included 91 Israeli adult participants (41 same‐sex fraternal twins; 50 same‐sex nontwin siblings), sampled through social media, who answered a series of questionnaires.ResultsResults indicated that twins reported less self‐differentiation, a poorer attachment history with their parents, and less secure attachment than nontwin siblings. Moderation analysis established that the positive link between parental differentiation and self‐differentiation was significantly stronger for twins than nontwin siblings. In contrast, sibling status had no moderating effect on the link between attachment history and style.ConclusionThese findings emphasize the significance of parental differentiation in twins' personal development and the importance of recognizing the unique bond between them.ImplicationsImplications for practitioners focusing on nurturing healthy development, strong sibling relationships, and individual well‐being are discussed.