Regarding the founder of the Qin dynasty, who was his grandfather?
King Xiaowen of Qin King Xiaowen of Qin (reigned 250 BC) was a Chinese king, who had a very brief reign. He is also known as Lord Anguo (安國君). His grandson was Emperor Qin Shi Huang.
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.