Ever since genealogically oriented DNA tests became generally available, I have been hearing stories of the sometimes unpleasantly surprising results of the tests. DNA tests work best in determining close relatives: siblings, parents and so forth. The generally vague ethnicity reports are interesting but rarely disturbing or surprising. But as the "Baby Switch" story above illustrates, not all the results can be easily assimilated into our traditional world view.
My own DNA test results have been mildly interesting but not yet helpful in my genealogical research. So far, I have 432 matches from Ancestry.com and 159 DNA matches from MyHeritage.com. Two of Ancestry.com DNA matches are close relatives that I recognize. Some of the other matches have recognizable surnames, although I have yet to see anyone I have met or know personally. This compares to over 100,000 Smart Matches on MyHeritage.com and thousands of Ancestry.com family tree matches. In addition, on the FamilySearch.org Family Tree, I can already see thousands of my deceased close relatives. I am not quite sure what to do with the living ones.
So far, I do have one result from a sibling and that probably puts to rest any fears I may have had of being switched at birth or adopted, but there are possibly still some surprises out there.
The real question is what am I supposed to do with the results from my DNA tests? I am not inclined to start contacting all the thousands of relatives listed by just these two programs. To the extent that I can determine, none of these "DNA relatives" have extensively documented family trees. In fact, the family trees I have available to view, do not show that any of these people so far have added sources or tried to documents their online family trees. In fact, some of the genealogical information I have seen from the family trees of the matches is totally inaccurate. At best, the information I have received is an incentive to me to correct the information in my portion of the FamilySearch.org Family Tree.