The third child of the earthly branch is bigamy. The third child of the earthly branch represents the presence of a scholar in the family, and also represents the presence of a bigamist in the family. Bigamy is not called bigamy after divorce, but a de facto marriage with another person of the opposite sex who cohabits and has children during the marriage. Bigamy refers to the act of one party having a spouse and registering a marriage with another person, or living with another person in the name of husband and wife, and knowing that another person has a spouse and registering a marriage with another person, or living together in the name of husband and wife.