For applying for your father, marriage certificate is compulsory as there is a section which proves he is your father. So, yes i uploaded that
birth certificate of parents i have not uploaded while filing i130 as they dont have and its not mandatory but it will be needed later while submitting NVC docs. So, i am trying to get their birth certificate done from our consulate. Alternate to that are many other things, but, DNA test is the most accurate thing you can get as proof if birth certificate is not there i believe