Although settling scores with sisters and brothers may be important in middle-age, add a few more years and most siblings start to mellow. The death of a parent can bring sisters and brothers closer to each other. "After an elderly parent dies, some families become more distant," says Andrew Scharlach, a University of Southern California researcher who is studying the impact on adults of parents' deaths. "But others become closer. One sister or brother begins to act in loco parentis , becoming the new head of the family or the kin keeper."
According to Purdue University psychologist Victor Cicerelli, the life cycle that begins with two or more siblings being each other's closest companions and best friends often ends the same way. Cicerelli interviewed more than 300 brothers and sisters and found a low level of rivalry among elderly sibs: 10% reported having arguments; 6% reported being bossed or attempts at domination by a sib; 8% reported feelings of competition--and that only rarely--and only a handful reported outbreaks of jealously, hostility, or snobbishness.