《太平广记·卷三百七十五·再生一》
于是，那官便设宴款待他。宴后，那官交给蔡支一封信，说： 请你把它交给我的外孙。 蔡支问： 你的外孙是谁？ 
乃盛设酒肴，毕付一书。谓曰： 掾为我致此书与外孙也。 吏答曰： 明府外孙为谁？ 
Then, the official gave a banquet in his honor. After the banquet, the official gave Cai Zhi a letter, saying, “Please deliver this to my grandson.” Cai Zhi asked, “Who is your grandson?”