If there were only few people on earth for many years ago? Then does that mean we all are family?

For exempel if there are only 1000 People in a village and they move to different places. To expland, won' t many end up having kids with familj members wetheir they are aware of it or not? Thats gross.
If there were only few people on earth for many years ago? Then does that mean we all are family?
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