Kite
That's certainly the case in my tree. My GGM from Gawsworth in Cheshire came from a family which had been in the village since before church records began and had intermarried with the other families in the village for nearly 400 years. She accounts for one-eighth of my genes and DNA of course, but at every generation backwards someone married a cousin or at least a blood relative of some sort.
Half my genes and DNA come from Scotland and I doubt has much to do with R3. They too intermarried.
In fact it is only in the last two or three generations that anyone in my tree appears to marry a completely random stranger. Even when they moved away from close family, they moved to be with more distant kin and married there.
The idea that everyone's genes are spread out evenly across the generations is a nice one but totally false as far as I can see.
OC
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