Petrus Johannes le Roux - Wife of P J le Roux 1848-1941

I need info on the wife of Petrus Johannes le Roux (1848-1941) before Anna Cecilia Dreyer. I want to know my grandfather's biological mother. I think my grand farther Petrus Johannes le Roux (1895-1977) was the only son. His marriage certificate indicates he was a widower when he married Anna Cecilia in 1905 and my grandfarther was 10 years old already as he was born in 1895. All info I have of his mother is that her names was Maria Magdalena Susanna .......... no further info.

Any help from anybody please.

Deon le Roux