Somewhere back there, Jeremiah shares an ancestor with Daniel (probably grandfather or great-), therefore making Jeremiah the second (1/32 shared genes) or third (1/128 shared genes) cousin of Daniel. Now consider the fact that Millicent looks just like Carolyn. I'm pretty sure Daniel is 6 generations back from Carolyn. So she shares 1/(2^6) = 1/64 of her genes with Daniel, and therefore 1/128 of her genes with Millicent. However, anyone is Carolyn's line is liable to be identical to Millicent, despite sharing at most 1/256 of their genes with her. So very few shared genes are required to produce identical appearance in DS world.
This was the crux of my argument, but whatever it was fun, I'll say no more.