At the risk of sounding like a conspiracy theorist goofball or some shit, those things are the dumbest dice roll you could ever do with your money. Going to Vegas and putting that money in any gamble is 1 million times a better way to spend it.
My friend now has his family (and potentially inheritance) wrecked over ancestry.com. Even ignoring the fact that the FBI can "sopena" your DNA for past crimes from those places against their and your will so you might as well walk into the FBI and ask them to take your blood sample for any past or future crimes, it can go south worse than you can imagine.
Let's see if it was a good deal for my friend's dad. I'll try to keep it short and skip over most of the stories because the gist is all you need. This started about 1 year ago and now is a day to day nightmare. His elderly retired (bored) dad decided to do it. Weeks later found out he knocked up a girl in Korea (now deceased) during the Korean War and now has relatives that made their way to the states, including a daughter living in the midwest who is now in her late 40s. At first she seemed (played) sweet (of course to this guy, he's old enough to be starting to lose his marbles either way, has not been able to make smart decisions with money in over a decade) and said she just wanted to meet, wanted the relatives to meet each other to be a family blah blah don't want money bullshitting blah.
Slowly she begins siphoning small amounts of money for this and that that she "needs", usually only around $200 at a time, then one occasion she asks and gets $5,000. She invites him out to meet and the first night he is there she takes him to a restaurant where they meet with her friends and family, and they get there and over 110 people are in the party. They chow down and then ask him to pay the whole bill. Skipping over a few similarly depressing stories and manipulation and guilt tripping, she is now trying to get in the guy's will to inherit his house, literally said "I don't want any money, I just want the house".
Just accept the fact that you are white or black or whatever.