Who is Deng Zhou's grandfather?

Zhang Zhongjing, a famous doctor in the Eastern Han Dynasty, was honored as a medical sage and wrote Treatise on Febrile Diseases, a native of Dengzhou, Henan. Guo Jia, a famous counselor in the Three Kingdoms period, was born in Yingchuan (now Linjiang ... Han Danchun), a calligrapher of the Wei Dynasty in the Three Kingdoms, the founder of Xiaolin, and a native of Yangzhai in Yingchuan (now Yuzhou, Henan). ......