Some of Conley's findings that rang true for me, the fifth of seven siblings: "If you attended college, there is almost a 50 percent chance that one of your siblings did not …. When parents have enough 'class' resources to go around—time, money, social connections—kids turn out more similarly since parents … can …compensate for inequities." But for many reasons—divorce, the closing of Northern factories or the opening of Sunbelt research parks, family size, the spacing of children within the family, cultural shifts in attitudes toward women, wild cards such as homosexuality or strong religious beliefs—parents may or may not have enough "class" resources for each child. A general rule: family size—and economic and social forces both within the family and within the broader culture—trump both birth order and genes. According to Conley, parents who have only two children control the environment and impart their values more easily. But "the family itself becomes a mass of competing influences when the numbers increase … community conditions, peer influences, and random chance all seem to play a greater role the more siblings there are."