"It's the best shot at power a haut-woman can ever get—a chance of becoming a dowager empress, if her son — and it's always and only a son — is ultimately chosen to succeed his father. Even being the mother of one of the losers, a prince-candidate or satrap governor, is no bad deal. It's also why, in an apparently patriarchal culture, the output of the haut-constellations is skewed to girls. A constellation head — clan chief, in Barrayaran terminology — can never become an emperor or the father of an emperor, no matter how brightly his sons may shine. But through his daughters, he has a chance to become the grandfather of one. Advantages, as you may imagine, then accrue to the dowager empress's constellation. The Degtiar were not particularly important until fifty years ago."