More information is needed in order to be able to advise about immigration possibilities for a father-in-law or for a step-father. That includes details such as your mother's own immigration status - is she a U.S. citizen?; where he and your mother live; his immigration-related history; your current age; etc. There really is no substitute for your family members consulting with an immigration attorney who, after learning all of the relevant information, could advise about immigration eligibilities, options and strategies and could then offer legal representation in the often quite complex application process.
US citizens cannot submit relative petitions on behalf of their fathers-in-law. They can however submit relative petitions on behalf of their step-fathers if the marriage that created the relationship took place before their 18th birthday.
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