《史记·三十世家·越王勾践世家》
长子说： 家里的长子叫家督，现在弟弟犯了罪，父亲不派长子去，却派小弟弟，这说明我是不肖之子。 
长男曰： 家有长子曰 家督 ，今弟有罪，大人不遣，乃遣少弟，是吾不肖。 
The eldest son said: "The eldest son in the family is called the head of the family. Now that my younger brother has committed a crime, my father does not send me, the eldest son, but sends my younger brother. This shows that I am an unfilial son."