First, you must be 21 years or older to file a petition for your father. If your mother is a US citizen or green card, she may also file the petition right away. However, it appears that your father was illegally in the US for at least 1 year before he left the country. This will create a problem for him to get a visa to return to the country after his I-130 petition is approved. He would need to obtain a waiver to forgive his unlawful presence. If you are the oldest child, you may have to wait for another 2 years but in the interim, I strongly suggest you talk to an attorney right away because, he has to start documenting the evidence of the hardship that you and your brother are and will continue to experience if CIS does not allow him to return to the country.
Answered on Aug 19th, 2013 at 7:50 PM