When did the ancient three generations refer to?

Three generations refer to the following five situations:

1. refers to Xia, Shang and Zhou:

The Analects of Confucius Wei Linggong: Simin is also the reason why three generations went straight. "Xing _ Shu:" Three generations, Xia, Yin and Zhou. "

2. Generally refers to the three dynasties:

Bao Zhao's "Wu Cheng Fu" in the Southern Song Dynasty: "Three generations of more than 500 years, melons split beans." This refers to the Han, Wei and Jin Dynasties.

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3. refers to the ancestors passed on to their descendants:

"Guang Chuan": "However, three generations of generals, taboo, from Guang to Ling, died, alas!"

4. Great-grandfather, grandfather and father:

Selected Records of the History of the Song Dynasty: "The compilation date, the list of names, nostalgia, three generations and other books are called short records."

5. Thirty years:

During the Zhou Dynasty, Wu Zetian ruled the country. When Wu Mei was young, her father asked Mr. Buxiang to visit the children. What the fortune teller said at that time was deeply imprinted in Wu Mei's mind, and he never forgot it until his death. Mr. Wang said, "After three generations of Tang Dynasty, the female was the king of Wu." The' three generations' here refers to thirty years.

In other words, thirty years after the Tang Dynasty, Wu's surname will be changed. This is an episode in history and another explanation of the' three generations'. "