Who was the real inventor of DNA?

No one invented DNA. It was discovered.  Who exactly
discovered it is up to interpretation.  Gregor Mendel is the father of genetics because
he figured out there was something that affected heredity.  He used pea plants to test
his theories.  He mixed colors, heights, etc and observed the results.  James Watson and
Francis Crick have been officially credited with discovering the alpha helix formation
of DNA.  Watson and Crick received the Nobel Prize for their discovery in
1962.