The pattern is simple:
After about 30–35 generations we are talking about billions of ancestors.
And yet:
The conclusion is simple: the same people appear in our family tree many times over.
For most of human history people:
In the countryside especially, the pool of potential partners was limited. Not because people wanted consanguinity, but because there was no alternative.
The result?
What we would today call “close kinship” was often simply the demographic norm.
The word “consanguinity” sounds like taboo. It suggests crossed lines, violence, scandal. Genealogy shows something less sensational — and more human.
We are not talking about parent–child or sibling relationships. We are talking about the realities of eras in which:
When I started digging into my own family, the theory stopped being abstract.
I found a marriage of my ancestors in which:
To a modern ear that sounds worrying. To them it was simply “normal”. That was the social structure, that was the pool of people, that was the world.
Because it shifts perspective:
The further back we go, the more we all become… family.
If you think your family tree definitely has no loops — you probably just have not found them yet.
Because human history is not an elegant tree. It is a dense web of connections, and each of us is a knot in it.
And perhaps that is why, instead of outrage, this knowledge should teach us humility.