I am currently 18 years old and a natural born citizen and i am in the national guard. my parents have been living illegally in America over 20 years. i was told that when i am 20 i can start paper work to sponsor my parents and that when i turn 21 my parents should start their legalization process. but will they have to leave the country ? will my parents be punished for living here illegally so long ? is there anything else i should know ?