My husband has been a legal resident since 1962. He is 53 now. In 19884 he was convicted of involuntary manslaughter and in 2002 of DUI Misdemeanor Class B. My 2 children & I are USA citizens. He has been working without stopping since he was 14. We pay Taxes, own our home 100%, 4 cars 100% and have almost no debt. He is about to open a new restaurant and in two years he will become a part-owner of that restaurant. Can he apply for his USA citizenship without having the risk of being deported. Thank you very much.