In her first interview since his death, 'Mandela's rock' and 'white granddaughter' Zelda la Grange shares personal memories of 16 years of service to the former South African president, writes David Smith
Alf Kumalo chronicled the Mandela family for 60 years, photographing the children as they were growing up and the man himself after his release. David Smith met the photojournalist before his death in 2012