I can find no trace of a George, Henry or George Henry Looper in South Africa unfortunately. As birth records are not available the only way to find him would be if he was baptised. Although many baptismal records are available on line, most of the Cape Town ones are scanned under the various churches, then the church in each suburb of which there are very many. The only way to find it would then be to take the records of each church in each suburb and go through each baptism over the applicable years. Would the marriage certificate possibly provide clues by looking at the witnesses?