Sibling Ties in Later Life: A Social Network Analysis

Using data from a study of 678 adults aged 55 and older, this article examines the role of siblings in four social support networks: confidants, companions, emotional support, and instrumental support, with a particular focus on the impact of gender and marital status on their role. Two types of analyses are used: probability analysis to determine the likelihood of specifying a given tie as a network member and compositional analysis of network membership. Three models of support (hierarchical compensatory, task specificity, functional specificity of relationships) are used to discuss the significant results regarding the probability of including a sibling in each network and the dominance of siblings in the overall composition of each network. The single, especially women, the childless, and widowed women stand out as having particularly involved sibling ties. Greatest support is found for the functional specificity model and for the value of combining probability and compositional analyses.