Close family relationships afford a person better health and well-being, as well as lower rates of depression and disease throughout a lifetime. But in many families, getting along isn't a given. The interaction between various members is at the core of these complicated dynamics. We may joke about the stereotypical sources of disharmony—the obnoxious uncle and the ne'er-do-well son—but factors like environment and sibling rivalries do emerge when considering the viability and stability of family networks.