The grandson's ancestor is Chen Wan, the son of Chen Ligong. His surname is Gui, and his surname is Chen. Lin, the youngest son of Duke Chen Li and Duke Chen Heng, killed Duke Li and established himself as Duke Zhuang. Therefore, Chen Wan could not be established as Doctor Chen. When Duke Zhuang died, he appointed his younger brother Chujiu as Duke Xuan. In the 21st year of Xuangong's reign, he killed his prince Yu Kou. The imperial bandits were on good terms with Wan, and for fear of harming themselves, Wan rushed to Qi. Duke Huan of Qi heard about Chen Wan's talents and wanted to make him a minister. Chen Wan declined on the grounds that "a minister in charge of travel cannot hold a high position." Later, Duke Huan of Qi appointed Chen Wan as Gongzheng (in charge of hundreds of jobs). After Chen Wan settled in Qi State, his family name was changed from Chen to Tian, ??so he was also called Tian Wan. Tian Wan's fifth grandson, Tian Shu (grandson's grandfather), was originally a senior official of the Qi State. He made great achievements in the war against Ju State. Qi Jinggong granted Le'an to Tian Shu and also gave him the surname "Sun". .