Just a few thoughts:
Are you SURE you are not a dependent of your father?
Is your tax return late, or are you in an area that had a disaster-postponement so the tax return is not late?
Showing you have been compliant with filing tax return is one of the factors for citizenship, so if your tax return was not filed on time that could be a factor. Although extensions are an option, the original due date was April 15th.
