Duke Huan of Qin
Duke Huan of Qin( died 577 BC) was from 603 to 577 BC the seventeenth ruler of the Zhou Dynasty state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying( 嬴), and Duke Huan was his posthumous title.
Duke Huan succeeded his father Duke Gong of Qin, who died in 604 BC, as ruler of Qin.
In 578 BC, Qin suffered a major defeat at the hand of the State of Jin.
Duke Li of Jin accused Qin of treachery and personally led an alliance of eight states( Jin, Qi, Song, Wey, Zheng, Cao, Zhu, and Teng) to attack Qin.
The two sides fought at Masui( in present- day Jingyang County, Shaanxi).
Qin was resoundingly defeated and two of its generals were captured, although Duke Xuan of Cao, ruler of Jin's ally Cao, was also killed in the battle.
The next year, Duke Huan died after 27 years of reign.
He was succeeded by his son, Duke Jing of Qin.
Duke Cheng of Qin
Duke Cheng of Qin (died 660 BC) was from 663 to 660 BC the thirteenth ruler of the Zhou Dynasty state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying , and Duke Cheng was his posthumous title.
Duke Cheng was the second of the three sons of his father Duke De of Qin.
His older brother Duke Xuan of Qin succeeded his father as ruler of Qin in 676 BC.
But when Duke Xuan died in 664 BC, he passed the throne to Duke Cheng instead of one of his nine sons.
When Duke Cheng died four years later, he did the same and passed the throne to the third brother Duke Mu of Qin, even though he had seven sons.
King Huiwen of Qin
King Huiwen of Qin( 356–311 BC), also known as Lord Huiwen of Qin or King Hui of Qin, given name Si( 駟), was the ruler of the Qin state from 338 to 311 BC during the Warring States period of Chinese history and likely an ancestor of Emperor Qin Shi Huang.
He was the first ruler of Qin to style himself" King"( 王) instead of" Duke"( 公).
Duke Gong of Qin
Duke Gong of Qin (died 604 BC) was from 608 to 604 BC the sixteenth ruler of the Zhou Dynasty state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying (嬴), and Duke Gong was his posthumous title.
Duke Gong succeeded his father Duke Kang of Qin, who died in 609 BC, as ruler of Qin.
He reigned for five years before dying in 604 BC.
He was succeeded by his son, Duke Huan of Qin.
Duke De of Qin
Duke De of Qin (710–676 BC) was from 677 to 676 BC the eleventh ruler of the Zhou Dynasty state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying , and Duke De was his posthumous title.
Duke De was the second of the three sons of his father Duke Xian of Qin.
His younger half-brother Chuzi was the first to succeed Duke Xian in 704 BC, but was killed six years later.
His older brother Duke Wu of Qin then ascended the throne and reigned for 20 years.
Although Duke Wu had a son named Bai (白), when he died in 678 BC it was Duke De who succeeded him, while Prince Bai was enfeoffed at the capital Pingyang.
In the first year of his reign, Duke De moved the capital to Yong (in present-day Fengxiang, Shaanxi), which would remain the capital of Qin until almost three centuries later, when Duke Xian (Shixi) moved the capital to Yueyang (櫟陽) in 383 BC.
However, Duke De reigned for only two years before dying in 676 BC, aged 34.
He had three sons, who would in turn ascend the throne as Duke Xuan, Duke Cheng, and Duke Mu, respectively.
Liu Xiangdao
Liu Xiangdao( 劉祥道)( 596 –666), courtesy name Tongshou( 同壽), formally Duke Xuan of Guangping( 廣平宣公), was an official of the Chinese dynasty Tang Dynasty who was briefly chancellor during the reign of Emperor Gaozong.
Marquis of Qin
The Marquis of Qin( died 848 BC) was the second ruler of the ancient Chinese state of Qin, founded when his father Feizi was granted a small fief at Qin by King Xiao of Zhou.
The Marquis of Qin succeeded his father, who died in 858 BC, and ruled for 10 years.
He died in 848 BC and was succeeded by his son Gongbo.
His ancestral name was Ying, but his given name is not known.
Although Qin would eventually develop into a major power that would conquer all other Chinese states and unite China in 221 BC to start the Qin Dynasty, at the time of the Marquis of Qin it was still a minor state of the Western Zhou Dynasty classified as an" attached state"( 附庸," fuyong").
Qin rulers did not receive any nobility rank until four generations later during the reign of Duke Xiang of Qin, so" the Marquis of Qin" was presumably an honorific posthumous title that his descendants used to refer to him.
Yukou
Crown Prince Yukou( died 672 BC) was the original heir apparent of Duke Xuan of Chen, the sixteenth ruler of the ancient Chinese state of Chen during the Spring and Autumn period.
In 672 BC, the 21st year of his reign, Duke Xuan's favourite concubine gave birth to a son named Kuan.
Duke Xuan killed Yukou and made Kuan his new heir apparent.
Prince Yukou was close to his cousin Chen Wan, son of Duke Li of Chen, the fifteenth ruler of Chen and Yukou's uncle.
Afraid that his life was also in danger, Chen Wan fled to the State of Qi in the northeast.
Duke Huan of Qi made Chen Wan an official in charge of manufacturing, and Chen Wan established the Chen( later known as Tian) clan in Qi.
The Chen clan of Qi would grow increasingly powerful over the centuries, and eventually usurped the Qi throne.
Duke Xuan died in 648 BC after 45 years of reign, and Prince Kuan ascended the throne, to be posthumously known as Duke Mu of Chen.
Duke Xuan of Qi
Duke Xuan of Qi( died 405 BC) was from 455 to 405 BC the titular ruler of the State of Qi during the transition from the Spring and Autumn to the Warring States period of ancient China.
His personal name was Lü Ji( 呂積), ancestral name Jiang( 姜), and Duke Xuan was his posthumous title.
Duke Xuan of Qin
Duke Xuan of Qin (died 664 BC) was from 675 to 664 BC the twelfth ruler of the Zhou Dynasty state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying , and Duke Xuan was his posthumous title.
Duke Xuan was the eldest of the three sons of his father Duke De of Qin, and succeeded his father as ruler of Qin when Duke De died in 676 BC, aged 34.
He reigned for 12 years and died in 664 BC.
Although Duke Xuan had nine sons, he passed the throne to his younger brother Duke Cheng of Qin, who would in turn pass the throne to the third brother Duke Mu of Qin.

Question: Who is the paternal grandfather of Duke Xuan Of Qin?
Answer: Duke Xian of Qin