Lots of people have accurate records concerning their ancestral lineage.
But I don't know of anyone that has accurate records going back 4000 years.
And even if they claimed they did have a list of their ancestors going back 4000 years, how could anyone possibly verify their records are absolute and not embellished?
For instance, did you know that England's crown claims to be royal descendants of the biblical King David?
Their myth goes like this:
When the Babylonians were destroying Jerusalem, the prophet Jeremiah escaped and took one of the daughters of King Zedekiah (myth has her name as Tea Tephi) to Egypt then sailed to Ireland and she married a king there and had descendants.
Jeremiah also took the Arc of the Covenant, the plate that held the bread, and
the stone Jacob laid his head upon):
Gen 28:11
(11) And he came to a certain place and stayed there that night, because the sun had set. Taking one of the stones of the place, he put it under his head and lay down in that place to sleep.
English myth has it as the same stone that is the coronation stone which is placed under the British throne (called the Stone of Destiny).
And thus, the British monarchy claimed
divine right to rule.
They went on to claim that they were the fulfilled prophesy of David not being without a descendant on the throne.
Jer 33
(17) “For thus says the LORD: David shall never lack a man to sit on the throne of the house of Israel,
This all lead to the bizarre doctrine of "British Israelism", that the English, Irish, Scottish are the "true" lost tribes of Israel.
And the KKK was happy to latch onto this myth claiming that "real" Israel (ie. "real" people of God) was white folks and were not to mix with people of color because God told Israel not to marry outsiders.
Of course the Irish/Scottish history tells a completely different story.
They knew nothing of a Jeremiah bringing a daughter of King Zedekiah and the Arc.
And the Tea Tephi in their history is a descendant of Japheth (son of Noah), not of Shem, so she couldn't possibly be of the line of David.
Also, their Stone of Destiny (that the English conquered and stole from them) originally was an oblong pillar type native stone (proven by science as native to Ireland, not Israel) set up as a shrine to their pagan gods.
This myth claimed that their Stone of Destiny would cry out when a king that their gods approved of touched it.
Their Stone of Destiny was erected in honor of the goddess Danu (of the Tuatha Dé Danann - Ireland's pantheon of gods).
And then you have the Black Israelite doctrine folks who claim they are the fulfillment of the "true" Israel being scattered to foreign lands as captives (ie. African negro slaves to England and to America).