You need to be 21 years old to file a petition on behalf of your father. However, his 2 deportations may make him inadmissible and may bar him from returning to the U.S. I strongly suggest that you contact an experienced immigration attorney for a face-to-face consultation and give him/her all of the facts surrounding your father's deportation and situation. (S)he would then be in a better position to analyze his case, and advise you of your options.
Answered on Aug 18th, 2015 at 12:20 AM