It means that once a person has more than 180 days of being unlawfully present in the U.S., they have a 3 year bar that once they leave, they cannot come back for 3 years unless they get a very hard to get waiver. It is 10 years once they reach 1 year or more of unlawful presence. So in order for your parents to do anything through an employer, they would have to leave the U.S. to petition to come back and if they leave, they will not be able to come back for 10 years unless they get a very hard to get waiver. So unfortunately, that's not really a solution for them. They basically have the following options:
1) Wait for the immigration reform that comes out. If it is approved the way that they are intending, then they may be able to get Residency if they entered the U.S. early enough.
2) Apply for Asylum (they had to have done this within the 1st year of being in the U.S. unless there is a credible excuse or changed country conditions), Withholding of Removal, Convention Against Torture, or Cancellation of Removal. The first three things are if they fear to return to their home country because they believe that they will be specifically targeted due to their race, religion, nationality, social group or political opinion and that they run a high risk of great bodily injury, torture, or death as a result. The last, Cancellation, they would have to prove that they have at least 10 years in the U.S. AND they must also prove that if they are deported, a U.S. Citizen or Lawful Permanent Resident that depends upon them will suffer exceptional and extremely unusual hardship. This hardship must be something more than emotional separation hardship or financial hardship, so it is difficult to get.
3) If they divorce and marry a U.S. Citizen (for love, of course), they could file for Residency without leaving the U.S. And the same if they have a U.S. Citizen son or daughter over 21 that petitions for them.
You basically have the same options. Since you did not reside in the U.S. since June 2007, you cannot qualify for DACA. I am truly sorry. I wish I had better news for you.
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