Parents of Thomas George Sampson South Africa Born 1884

I Am trying to track down my Great Grandfather Thomas George Sampson
Born: July 27 1884 Uitenhage, South Africa
Died: July 19 1951 Port Elizabeth South Africa

Married:
Dorothy Evelyn Sampson (born Gilbert)
Born: July 7 1886
Died: Aug 11 1953 Port Elizabeth South Africa

Any information on finding their parents would be great.

Thanks
Donovan Sampson