Duke Xian of Qi
Duke Xian of Qi (died 851 BC) was from 859 to 851 BC the seventh recorded ruler of the State of Qi during the Western Zhou Dynasty of ancient China.
His personal name was Lü Shan (呂山),
ancestral name Jiang (姜), and Duke Xian was his posthumous title.
Duke Xian was a younger son of Duke Gui of Qi.
When Duke Gui died, Duke Xian's older brother Buchen ascended the throne, to be posthumously known as Duke Ai of Qi.
Duke Ai had a dispute with the marquis of Qi's neighbouring state Ji (紀).
King Yi of Zhou sided with Marquis of Ji and executed Duke Ai by boiling him to death.
King Yi then installed Jing, a half-brother of Duke Ai and Duke Xian, on the throne, to be posthumously known as Duke Hu of Qi.
Duke Hu moved the capital of Qi from Yingqiu (later known as Linzi) to Pugu (or Bogu).
The move was resented by the people of Yingqiu, who rebelled under the leadership of Duke Xian.
Duke Hu was killed and Duke Xian ascended the throne.
Duke Xian expelled the sons of Duke Hu and moved the capital back to Linzi.
He reigned for 9 years and died in 851 BC.
He was succeeded by his son, Duke Wu of Qi.
Duke Cheng of Qi
Duke Cheng of Qi (died 795 BC) was from 803 to 795 BC the eleventh recorded ruler of the State of Qi during the Western Zhou Dynasty of ancient China.
His personal name was Lü Yue (呂說), ancestral name Jiang (姜), and Duke Cheng was his posthumous title.
Duke Cheng succeeded his father Duke Wen of Qi, who died in 804 BC, as ruler of Qi.
He reigned for 9 years and died in 795 BC.
He was succeeded by his son, Duke Zhuang I of Qi.
Duke Gui of Qi
Duke Gui of Qi( reigned c. 10th century BC) was the fourth recorded ruler of the ancient Chinese state of Qi during the Western Zhou Dynasty.
His personal name was Lü Cimu( 呂慈母) and ancestral name was Jiang( 姜).
Duke Gui succeeded his father Duke Yǐ of Qi, and was succeeded by his son Duke Ai of Qi.
Two of his younger sons also later ascended the throne as Duke Hu of Qi and Duke Xian of Qi, respectively.
Wen Jiang
Wen Jiang( died 673 BC) was a princess of the State of Qi and duchess of the State of Lu during the Spring and Autumn period of ancient China.
She was a daughter of Duke Xi of Qi and sister of Duke Xiang and Duke Huan of Qi.
She was the main wife of Duke Huan of Lu and mother of Duke Zhuang of Lu. She is best known for having an incestuous relationship with her brother Duke Xiang, who had her husband murdered.
Her clan name was Jiang( 姜) and Wen was her posthumous title.
Duke Wen of Qi
Duke Wen of Qi (died 804 BC) was from 815 to 804 BC the tenth recorded ruler of the State of Qi during the Western Zhou Dynasty of ancient China.
His personal name was Lü Chi (呂赤), ancestral name Jiang (姜), and Duke Wen was his posthumous title.
Duke Wen's father Duke Li of Qi was a despotic ruler, and in 816 BC the people of Qi rebelled and tried to make the son of Duke Hu of Qi, Duke Li's grand-uncle, the new ruler.
Duke Li was killed by the rebels, but Duke Hu's son also died in the fighting.
Subsequently, Duke Wen ascended the throne, and executed 70 people who were responsible for his father's death.
Duke Wen reigned for 12 years and died in 804 BC.
He was succeeded by his son, Duke Cheng of Qi.
Zhao Cui
Zhao Cui (died 622 BCE), posthumously known as Zhao Chengzi (Chengzi of Zhao), courtesy name Ziyu (子餘), was a dafu of Duke Wen of the Jin state during the Spring and Autumn period.
He was the clan leader of Zhao between 636 and 622 BCE.
When Chong'er, later known as Duke Wen of Jin was in exile due to the Li Ji unrest, Zhao Cui had always followed Chong'er.
In the state of Qin, they received the assistance of Duke Mu of Qin.
After Duke Wen's death, he served Duke Xiang of Jin and participated in the battle of Pengya.
Jin army defeated Qin army in this battle.
Duke Yǐ of Qi
Duke Yǐ of Qi( reigned 10th century BC) was the third recorded ruler of the ancient Chinese state of Qi during the Western Zhou Dynasty.
His personal name was Lü De( 呂得) and ancestral name was Jiang( 姜).
Duke
Yǐ succeeded his father Duke Ding of Qi, and was succeeded by his son Duke Gui of Qi.
Duke Li of Qi
Duke Li of Qi (died 816 BC) was from 824 to 816 BC the ninth recorded ruler of the State of Qi during the Western Zhou dynasty of ancient China.
His personal name was Lü Wuji (呂無忌),
ancestral name Jiang (姜), and Duke Li was his posthumous title.
Duke Li succeeded his father Duke Wu of Qi, who died in 825 BC, as ruler of Qi.
He was a despotic ruler, and in 816 BC the people of Qi rebelled against him and tried to make the son of Duke Hu of Qi, Duke Li's grand-uncle, the new ruler.
Duke Li was killed by the rebels, but Duke Hu's son also died in the fighting.
Subsequently Duke Li's son Duke Wen ascended the throne, and executed 70 people who were responsible for Duke Li's death.
Duke Hu of Qi
Duke Hu of Qi
(reigned 9th century BC) was the sixth recorded ruler of the ancient Chinese state of Qi during the Western Zhou Dynasty.
His personal name was Lü Jing (呂靜),
ancestral name Jiang (姜), and Duke Hu was his posthumous title.
Duke Hu was a younger son of Duke Gui of Qi.
When Duke Gui died, Duke Hu's older half-brother Buchen ascended the throne, to be posthumously known as Duke Ai of Qi.
Duke Ai had a dispute with the marquis of Qi's neighbouring state Ji (紀).
King Yi of Zhou sided with Marquis of Ji and executed Duke Ai by boiling him to death.
King Yi then installed Duke Hu on the throne.
Duke Hu moved the capital of Qi from Yingqiu (later known as Linzi) to Bogu.
The move was resented by the people of Yingqiu, who rebelled under the leadership of Duke Hu's half-brother Shan, who was the younger full-brother of Duke Ai.
Duke Hu was killed and Shan ascended the throne, to be known as Duke Xian of Qi.
Duke Wen of Qin
Duke Wen of Qin( died 716 BC) was from 765 to 716 BC the seventh ruler of the Zhou Dynasty Chinese state of Qin that eventually united China to become the Qin Dynasty.
His ancestral name was Ying, and Duke Wen was his posthumous title.

Question: Who is Duke Wen Of Qi's paternal grandfather?
Answer: Duke Wu of Qi