Sibling property disputes were observed in 40 families, each with a 2-
and a 4-year-old child, to study the application of principles of ent
itlement. Conflict outcomes, parent support, and justifying arguments
were each analyzed in disputes involving ownership, possession, sharin
g, and property damage. Ownership and possession each influenced the c
onduct and outcomes of disputes, with ownership taking precedence over
possession in children's arguments and in dispute outcomes. Parents d
id not clearly support either principle on its own and were as likely
to argue in terms of possession as ownership rights. Parents supported
children's sharing and prohibited property damage, but conflict outco
mes upheld these principles only when parents intervened. Analyses rev
ealed the strong influence of young children who argued, with increasi
ng differentiation and sophistication, for principles of entitlement t
hat were not strongly endorsed by their parents.