Second, if you were born in a country
whose natives are ineligible, but neither of your parents was born there or resided there at the time of
your birth, you may claim nativity in one of your parents’ countries of birth if it is a country whose natives
qualify for the DV-2012 program.
Это всего-навсего правила лотереи
http://travel.state.gov/pdf/1318-DV2012Instructions-ENGL.pdf