Do I qualify for obtaining a Chinese Passport?

Good afternoon Sirs,

I am South African born by a Chinese father and German mother. My grandfather came to South Africa from Main Land China, can I apply for a Chinese Passport? or how do I go about changing my nationality to Chinese from South African? I would appreciate your reply in the above matter in due course.

Kind regards
Sherene Forsyth
043 - 748 5569
083 528 1256