Go back about 600 years then we all had about 2 to the power of 24 forefathers, (based on a generation being about 25 years, so about 4 generations per 100 years) that's about 16,000,000 forefathers (and mothers, of course ) that each of us had. That's maybe enough forefathers for each one of us, equivalent to the whole population of Europe at that time.
Because we all could not possible have had that number of forefathers each, it is obvious that we are all inter-related to varying degrees, and we all shared some of those forefathers, and subsequent generations.
The more racist you are, the less likely it is that you would marry someone of another ethnicity, and the more likely you are to be more closely related to your partner.
Whereas non-racists might be more attracted to partners of a different ethnicity, and therefore less likely to be closely related to their partner.
It's just maths.
But I don't expect you to be able to understand it and you'll probably reply with some gobbledygook nonsense.
But take it from me, if you go back about 800 years (remember now 2 to the power of 32), each of us would have about 4.25 Billion forefathers. So ignoring intermarrying cousins, etc, one person would have probably the equivalent of the population of the planet as it was at that time.
Not reading all that waffle jeez us wept