My mom said Obamacare is the first step in the government requiring us to give a DNA examples when we file our taxes

I highly doubt that. We shouldn't believe everything our relatives, friends, or others relations tell us. From experience, I've found my family to be less informed than I thought growing up. Besides, to examine DNA samples it would take trillions of dollars to fund such a program, let alone the resources necessary. Paranoia isnt something that should be spread. Millions of people file taxes every year, it would cost more than any war we've fought thus far. So no, tell mom to stop being so paranoid. No one cares about your DNA.