Fuxi was the earliest, a figure from the mythical age, when there were no people or just when there were people.
Emperor, the earliest China began to enter "society". Strictly speaking, "China" began to sprout, which was the beginning of primitive society.
Dayu was the end of primitive society.
It doesn’t matter. In other words, there was no concept of descendants in that era. Many things that seem natural to us now did not exist at that time. In the Fuxi era, there was no family and there was no concept of descendants. From the emperor to Dayu According to legend, the primitive society was thousands of years old. At that time, there was a family, but the relationship between men and women was not as strict as in the later period. Men farmed and women weaved, helping each other to live together. In short, you want to read the legends about this era. You can make it up any way you want. In terms of history, there are no records left at all except historical events with big names. At that time, humans were probably not able to identify blood relationships.