Can I fix my dad’s papers if he got deported around 11 or 12 years ago?

Significantly more information is needed in order to provide a legal analysis of whether you may sponsor your father for immigration benefits following his 11 - 12 years absence from the U.S. Those details will include, for example, the reason he was deported/removed more than 10 years ago. There really is no substitute for you and your father to consult with an immigration attorney who, after learning all of the relevant information, could advise about eligibilities, options and strategies to attain your goals, and who then could offer legal representation in the often complex application process.