These happen in about 1% of cases per generation. Common causes are secret adoptions, infidelity within marriage, and illegitimacy. NPE stands for Non-Paternity Event or Not the Parent Expected. unless there has been an NPE along the way. If you are male, your Y-DNA should be exactly the same as your father's Y-DNA and your grandfathers, etc all the way back on the direct male line. And test the oldest generation, so that would be your father, uncle, or grandfather.
More nice pictures for the kids school projects. And because both go back about 200,000 years to Africa, they will also give you the crude migration routes those particular ancestors took. both Y-DNA and mtDNA will tell you where that one particular ancestral line originated (eg Western Europe).Check out this blog post for more info - Making the best of what's not so good by Judy G Russell, The Legal Genealogist, 22 February 2015. None of the tests are accurate enough currently to pinpoint ancestral homelands but they might point you in the right direction. the general opinion among genetic genealogists is that 23andme gives the best genetic ethnicity estimates, followed by Ancestry, and then FamilyTreeDNA.Still, it makes for a pretty picture which the kids can print out and take to school. Currently this ethnic admixture test (also known as biogeographical analysis) only gives crude estimates and will continue to be refined over time. "Central Europe" or "France/Germany") but is unlikely to identify a particular country. It will also give you rough estimates on a sub-regional level (e.g. atDNA will tell you roughly what percentage of your DNA is from Europe, Asia, Africa, etc.
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