If you are over 21, then yes, you can petition him. He may or may not be able to complete the process in the US.
You should retain an experienced immigration lawyer to review all the facts, advise you, and handle the case. You can find one through http://www.ailalawyer.com.
J Charles Ferrari
Eng & Nishimura
The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.
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NYC EXPERIENCED IMMIGRATION ATTORNEYS
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If you are over 21, you may petition for your father. He may be eligible to adjust status here in the United States and not have to go through with consulate processing in his native country. You should contact an attorney to go over specifics.
Yes you can file for your dad if you are at least 21 years old. He may not be sent back to his country and may not need a waiver either as he is an immediate relative of a US citizen with a legal entry to the US. You should hire an attorney to help though.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.