It all depends on why he was deported. Also, as an 18 year old, you cannot petition for him just yet, you must be 21. Is you mother a US Citizen? If so, is she legally married to your dad? I strongly urge you to retain an experienced immigration attorney who will be able to review your dad's situation and advise you of what options, if any, are available for him. Good Luck.
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My colleagues are correct ... only an attorney reviewing his file can answer your questions.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.