The father and superintendent apparently had previous problems and the father planned to interfere in the graduation ceremony. I’m still not convinced it wasn’t racially motivated, but regardless the man needs help.
https://www.dnasquirrel.com/ provides some guidance on how to get DNA results while maintaining privacy. I haven’t tried it yet, but I’d like to hear if anyone has.
https://www.dnasquirrel.com/
This site walks you through how to take a DNA test anonymously. That’s as close as I’m aware of that you can get to privacy.