The blending of DNA of humans occur in such a complex permutation via each and every generation.
However, as with statistics, it is possible that a complete match of DNA can be found somewhere in the world that is exactly identical with each other and without any similarity in parentage.
Wikipedia's Entry on Population Genetics
|Picture from Boing Boing|
Do you see any resemblance when you look into the mirror every morning?
Now that you know it, like it, then you must share it!