Born 12/12/59 in Vicksburg, MS ISO birth Father (Mothers name was Ruby Nell Dungan)

I am a female born 12/12/59 in Vicksburg, MS. I am searching for my birth Father. My Mother's name was Rubly Nell Dungan at the time of my birth. She has since passed away and left no positive identification of my Father. I would desperatley like to know him or his identity and if I have any siblings on his side of the family.