Duke Zao of Qin
Duke Zao of Qin( died 429 BC) was from 442 to 429 BC the 23rd ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying( 嬴), and Duke Zao was his posthumous title.
Duke Zao succeeded his father Duke Ligong of Qin, who died in 443 BC, as ruler of Qin.
In 441 BC, the Qin city of Nanzheng( in present- day Hanzhong) rebelled.
In 430 BC, the Rong state of Yiqu invaded Qin, advancing to the Wei River.
Duke Zao reigned for fourteen years and died in 429 BC.
He was succeeded by his younger brother Duke Huai of Qin, who had been exiled in the State of Jin.
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 Ligong of Qin
Duke Ligong of Qin (died 443 BC) was from 476 to 443 BC the 22nd ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying (嬴), and Duke Ligong was his posthumous title.
Duke Ligong succeeded his father Duke Dao of Qin, who died in 477 BC, as ruler of Qin.
In 461 BC, Duke Ligong dispatched an army of 20,000 men to attack the Rong state of Dali (in present-day Dali County, Shaanxi), and captured its capital.
In 456 BC, the State of Jin attacked Qin, taking the city of Wucheng (武城, in present-day Hua County, Shaanxi).
In 453 BC, the Zhao, Han, and Wei clans of Jin jointly attacked Zhi, the most powerful of Jin's four major clans, killed its leader Zhi Yao, and divided the territory of Zhi amongst themselves.
The state of Jin was effectively partitioned into three new states.
Some of the survivors of the Zhi clan fled to Qin.
In 444 BC, Qin attacked Yiqu (in present-day Ning County, Gansu), another Rong state, and captured its king.
Duke Ligong reigned for 34 years and died in 443 BC.
He was succeeded by his son Duke Zao of Qin.
Chuzi II
Chuzi( 389 BC or 388–385 BC) was from 386 BC to 385 BC the 28th ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying( 嬴), and Chuzi was his posthumous name.
He was the second of two child rulers of Qin called Chuzi.
He is also variously referred to as Duke Chu of Qin( 秦出公), Shaozhu of Qin( 秦少主), or Xiaozhu of Qin( 秦小主)( Shaozhu and Xiaozhu both mean" Young Lord").
Chuzi was the grandson of Duke Jian of Qin, who was the uncle of his predecessor Duke Ling.
When Duke Ling died in 415 BC, the throne passed to his uncle Duke Jian instead of to his son, the later Duke Xian.
Duke Jian reigned for 15 years and was succeeded by his son, Chuzi's father Duke Hui II, who reigned for 13 years and died in 387 BC.
When Chuzi succeeded his father as ruler of Qin he was either one or two years old, and the state of Qin was effectively controlled by his mother, the duchess dowager.
Just two years later, in 385 BC a minister in the government, Jun Gai( 菌改), rebelled against Chuzi and the duchess.
He led his forces to escort Duke Xian, who was at the time exiled in the State of Wei, back to Qin, killed Chuzi and his mother and installed Duke Xian on the throne.
Chuzi was just three or four years old when he died.
Duke Huai of Qin
Duke Huai of Qin (died 425 BC) was from 428 to 425 BC
the 24th ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying (嬴), and Duke Huai was his posthumous title.
Duke Huai was the younger son of Duke Ligong of Qin, who died in 443 BC and was succeeded by Duke Zao of Qin, Duke Huai's older brother.
When Duke Zao died in 429 BC, Duke Huai was exiled in the State of Jin.
He returned to Qin and took the throne.
In 425 BC, the fourth year of Duke Huai's reign, Qin general Chao (鼌) and other ministers rebelled against Duke Huai.
Duke Huai was besieged and committed suicide.
As his son Crown Prince Zhaozi (昭子) died early, the ministers installed Zhaozi's son Duke Ling of Qin on the throne.
Duke Huai also had a younger son, later known as Duke Jian of Qin, who would succeed Duke Ling as the 26th ruler of Qin.
Duke Jian of Qin
Duke Jian of Qin( 428–400 BC) was, from 414 to 400 BC, the 26th ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying( 嬴), and Duke Jian was his posthumous title.
Duke Jian was the younger son of Duke Huai of Qin and the uncle of his predecessor Duke Ling.
When Duke Ling died in 415 BC, the throne was passed to Duke Jian instead of Duke Ling's son, the later Duke Xian.
During Duke Jian's reign Qin was defeated several times by the State of Wei, then a major power of the Warring States period.
Duke Jian reigned for 15 years and died in 400 BC, aged 28.
He was succeeded by his son, Duke Hui II of Qin.
Duke Ling of Qin
Duke Ling of Qin (died 415 BC) was from 424 to 415 BC the 25th ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying (嬴), and Duke Ling was his posthumous title.
Duke Ling's predecessor was his grandfather Duke Huai of Qin.
In 425 BC Qin general Chao (鼌) and other ministers attacked and besieged Duke Huai, and Duke Huai committed suicide.
As Duke Huai's son Crown Prince Zhaozi (昭子) died early, the ministers installed Duke Ling, Zhaozi's son, on the throne.
In 419 BC, the sixth year of Duke Ling's reign, Qin attacked the State of Wei at the city of Shaoliang (少梁, in present-day Hancheng, Shaanxi).
Duke Ling reigned for 10 years and died in 415 BC.
However, the throne was passed to his uncle Duke Jian of Qin, son of Duke Huai and younger brother of Zhaozi.
Duke Ling's own son Shixi, later known as Duke Xian, was exiled to the State of Wei.
Duke Xian would eventually ascend the throne nearly 30 years later, after Duke Jian's grandson Chuzi II was killed.
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.
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 Huai of Jin
Duke Huai of Jin (died 637), personal name Yu, was briefly the duke of Jin (.637) during the Spring and Autumn period of the Zhou dynasty.

Question: Who is the paternal grandfather of Duke Huai Of Qin?
Answer: Duke Dao of Qin