My husband was brought to the US by his parents when he was 6 years old. At the age of 15 he went back to Mexico and at the age of 17 he tried to come back to the US. He was caught at the border and signed some papers. He tried another time after that and finally made it. My husband is now 22 years old. He does not have a criminal background here in the US. Can I help him get permanent residency in Illinois? Does he have to go back to Mexico and spend some time there before filing any paperwork?