Should we interbreed with our family members?

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Would interbreeding with our family members speed up the evolutionary process?

By restricting the size of the breeding population, you will likely see a drastic change in the new population through rapid genetic drift and the founder's effect (rather than natural selection). The new population may exhibit traits that seem at odds with their survival. If the population doesn't grow over the generations, genes will become fixed and the genetic variance suffers. Not a good thing, as a single genetic weakness may wipe out an entire population.

Jam it back in, in the dark.