Regarding the founder of the Qin dynasty, who was his grandfather?
Qin Shi Huang Qin Shi Huang ( ; 18 February 25910 September 210) was the founder of the Qin dynasty (秦朝 ) and was the first emperor of a unified China. He was born Ying Zheng (嬴政 ) or Zhao Zheng (趙政 ), a prince of the state of Qin. He became the King Zheng of Qin (秦王政 ) when he was thirteen, then China's first emperor when he was 38 after the Qin had conquered all of the other Warring States and unified all of China in 221 BC. Rather than maintain the title of "king" borne by the previous Shang and Zhou rulers, he ruled as the First Emperor (始皇帝 ) of the Qin dynasty from 220 to 210 BC. His self-invented title "emperor" (皇帝 , "  "), as indicated by his use of the word "First", would continue to be borne by Chinese rulers for the next two millennia.
Sima Jun Sima Jun (113–197), courtesy name Yuanyi, was an official who lived in the Eastern Han dynasty. He was the father of Sima Fang and the grandfather of Sima Yi.