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.
Zhang Han (Qin dynasty) Zhang Han (died 205 BC) was a military general of the Qin dynasty. When uprisings erupted throughout China during the reign of Qin Er Shi, Zhang Han led the Qin armies and successfully quelled several of these rebel forces. In 207 BC, Zhang Han was defeated by Xiang Yu of Chu at the Battle of Julu, after which he surrendered along with his 200,000 troops. He was conferred the title of "King of Yong" (雍王) by Xiang Yu and given part of the lands in Guanzhong as his fief when Xiang split the former Qin Empire into the Eighteen Kingdoms after the fall of the Qin dynasty. Zhang Han's territory was conquered by Liu Bang in 206 BC, and he committed suicide a year later.