People make mistakes. You need to correct the errors, and provide the college with any info they ask for. If income isn’t appreciably changed, you might not see any change at all in your aid. Just do what they ask…and see.
If your dad is married, and you reside with him most…and he is the parent on your FAFSA…his wife needs to be included. The marital status should have been “married” if they were married the day you filed your FAFSA form.
But I do believe you will still have an issue if he was married and filed as Head of Household. This can be done but only in very special circumstances. Usually married folks file as Married Filing Jointly or Married Filing Separately. If your parent tax filing status doesn’t match their marital status, this could be an issue as well.
@BelknapPoint your thoughts?