Yes, great-grandfather was grandfather's father. His great-grandfather was his great-grandfather's father, which was also his grandfather's father.
His great-grandfather's father called him Tianzu. According to the explanation of Er Ya, the father of Gaozu was called Tianzu.
Liu Bang's father was Liu Taigong. Grand Duke Liu was Liu Bang's father. He did not have an official name in the history books and was only known as Grand Duke Liu. He was a commoner from Fengyi, Pei County (now Xuzhou City, Jiangsu Province), who made a living by farming. Liu Taigong had four sons, of which Liu Ji was the Han Gaozu Liu Bang. Therefore, Liu Taigong was the father of Liu Bang, the emperor of the Han Dynasty.
Liu Chang, the protagonist of his father, Emperor Gaozu of Han Dynasty, became emperor, but the search results did not mention the exact time. Therefore, I don't know when my father, Liu Chang, the protagonist of Emperor Gaozu of Han Dynasty, became the emperor.
The female lead in this novel by my father, Emperor Gaozu of Han Dynasty, was Lu Zhi. Lu Zhi was Liu Bang's empress. She was much younger than Liu Bang. She looked cold, solemn, and dressed luxuriously. She had a daughter, Liu Le, an eldest son, Liu Ying, and a second son, Liu Chang. Therefore, Lu Zhi was the heroine of his father, Emperor Gaozu of Han Dynasty.
Liu Bang had three wives: Empress Lu, Lady Qi, and Empress Dowager Bo.
Liu Bang had eight sons and one daughter. Among them, the eldest son, Liu Fei, was the eldest son of Liu Bang. He was granted the title of King Qi, but was assassinated by Empress Lu during the banquet. Prince Liu Ying became Emperor Hui of the Han Dynasty after he succeeded to the throne, but he was controlled by Empress Lu during his reign and eventually died of depression. The ending of the other sons was not mentioned. His daughter, Princess Lu Yuan, married Zhang Ao and later Liu Ying. Liu Bang's children had different fates, and their stories gave us some warning.
The descendants of Liu Bang, Emperor Gaozu of Han Dynasty, were arranged as follows: 1. King Daohui of Qi-Liu Fei (born to Cao Ji);2. Emperor Hui of Han-Liu Ying (born to Empress Lu);3. King Yin of Zhao-Liu Ruyi (born to Lady Qi);4. King Dai/Emperor Wen of Han-Liu Heng (born to Empress Dowager Bo);5. King Liang-Liu Hui (demoted to King Gong of Zhao, King Huaiyang-Liu You-demoted to King You of Zhao)
The sons of Emperor Gaozu of Han Dynasty were Liu Fei, Liu Ying, Liu Ruyi, Liu Heng, Liu Hui, Liu You, Liu Chang and Liu Jian.
Han Gaozu's grandfather was Liu Qing. Liu Qing was a doctor in Wei at the end of the Warring States Period. Later, he moved to Feng County and was buried in the ancestral tomb of the Han Emperor. Liu Qing was Liu Bang's grandfather, the origin of the Liu family.