One thing to consider when you have your DNA tested is the possibility of an unexpected relative popping up.
It is possible that you may find that unknown people match you very closely. When you discover the relationship it may have one of three outcomes.
First, you yourself may have to add a collateral half-relative to your family tree. This will not change any of your ancestry greatly but could change the image you have of your ancestors.
Second, you may feel sympathetic to the newly found half-relatives that you discovered. These relationships would almost NEVER have been discovered except for the DNA test. The old-fashioned paper records approach to genealogy would not reveal most clandestine liaisons. DNA, however, highlights all illegitimate parentage. You hopefully feel sympathy to the new relation who just lost a quarter or more of their family tree due to unexpected DNA results.
Third, you should feel apprehension. The next new surprise on the DNA parade just might destroy a quarter of your family tree. If you have poured many hours and many dollars fleshing out a line of a family, it will be devastating to discover that your "ancestor" wasn't even your ancestor.
DNA is a great tool. Like every tool there can be dangers lurking. Don't run with a pair of scissors.
