Life Course Studies of Siblings of Individuals With Developmental Disabilities.

This article presents information on the life course studies of siblings with developmental disabilities. The sibling relationship constitutes the longest lasting family tie, beginning with the birth of the younger sibling and ending with the death of one member of the sibling pair. Siblings share a common family heritage, both genetically and experientially, and perhaps for this reason, the sibling relationship is normatively characterized as egalitarian, reciprocal, and mutual. In addition, there may be less genetic and experiential similarity between members of the sib-pair and less egalitarianism and reciprocal exchange due to unequal abilities and patterns of life course outcomes. However, there may also be greater continuity in contact across the life course when the sibling has a developmental disability. A growing body of research on adult sibling relationships when one individual has a developmental disability suggests that, in general, these siblings tend to maintain high levels of involvement across the life course, although there is variability in the degree of contact and closeness.