How can my dad get a green card quick?

How and with whom did you come to the US and on what basis are you getting your US citizenship? Please let me know if you have any additional questions or how I can be of further assistance to you in this matter.

Sorry to disappoint you, but nothing in the immigration law and practice is ever easy or quick. You did not say whether your father is in the U.S. or abroad. So lets look at both possibilities. Assuming that your father is abroad, I have to say that, if you are your father's only blood relative in the U.S., and there is no company that would sponsor him for a green card, than you both have a long wait ahead of you. You have to be 21 to file a petition for your father. The petition now takes from 7 months to a year to get approved. Then the case goes to the National Visa Center and to the U.S. embassy in the country where your father lives. All this now takes, depending on the country, about a year (no one can say how long this process will be taking 8 years from now). If your father is in the U.S. and entered legally, it is almost the same story - wait until you are 21, and file the petition. The difference is that, with your petition, your father would file an application for a green card, and the entire process would be done in the U.S., without going to an interview at the U.S. embassy in your father's native country. If your father is in the U.S. and illegal, it is possible that he might obtain legal status if it can be proven to the Immigration Court that his deportation would cause "exceptional and extremely unusual hardship" to his U.S. citizen or permanent resident wife, child, or parent. This is not an easy thing to do, and all the circumstances of the case have to be carefully analyzed by an immigration attorney in a personal, confidential consultation.

You have to be at least 21 to sponsor your dad.

He needs to find a sponsor to petition for him. You, unfortunately, cannot file a petition for him, until you are 21.