I can't seem to find any trace of my great grandfather's parents. My great grandfather was Adriaan Johannes Jacobus Oosthuizen born 1881 in Clanwilliam. He married Susanna Francina Bekker on 28 Dec. 1920 in Reitz, Free State. He was a manager of a brick manufacturing plant in Witbank before he got married. Please can someone assist me with the names and other details of his parents and siblings?