There was a project earlier called the Xia-Shang-Zhou Chronology Project, but because it's a sensitive matter for Chinese, as well as the political situation regarding the People's Republic of china, there's a ton of dispute about it.
Even in Chinese texts, it doesn't all agree. The Shiji, for example, paints a starkly different picture than the Bamboo Annals about the circumstances of Taijia's Reign and the Role of Yi Yin.
The two main schools of thought regarding the Xia is that one believes it was just a fabrication made by the Zhou to justify conquering the Shang, so the Xia's customs and metrics are diametrically opposed to the Shang. On the other hand, people didn't believe that the Shang existed either until the oracle bones were unearthed.
Note that this is not necessarily racism, as the first people to start this kind of doubt wwas actually chinese. They were known as the Doubting Antiquity School, started by the famous Hu Shi.
However, it is notable that a similar situation occured in Sumeria, also having a lot of written history that was not corroborated by archaeology. However, for whatever reason it wasn't questioned nearly as much as the Xia. In the end, it's arguable that the two are about as equal in historicity.
As for Confucius's family tree, you have to remember one thing. All family trees are prepared by the members of their family. For any and all kinds of political reasons, it may be altered without any way of proving that it has been done. You can literally dig up his family tree buried next to him in the tomb and still not be sure that it hasn't been doctored, perhaps even by Confucius himself.
Note that Confucius was not well-respected until well after the start of the Han Dynasty, before which the Qin Dynasty practiced hard control over text and Xiang Yu burned most of the records in Xianyang. It's just not possible to zero in on anything as a 100% accurate "family tree" of Confucius.