The U.S. Constitutionâs 10th Amendment is arguably the most important of all the amendments in the brilliant document that helped shape the United States.
Not even identical twins have the same DNA--although theirs would be far closer than anyone else's. DNA changes over time. Odds of two siblings having the same DNA who did not split from the same zygote are vanishingly small.
Culturally they may each say they are â1/8th Cherokeeâ but at the DNA level, one may have no Cherokee DNA at all. So yes, it is definitely possible for two siblings to get pretty different ancestry results from a DNA test. Even when they share the same parents.