JAN BORNMAN SITTING on the bed in the room he shares with his mother and younger sister, Nsikelelo Mamba, 16, has to squint to better watch a programme on the television less than a metre in front of him. His sister, Samkelisiwe, 12, doesn’t have to squint quite as much, but her eyesight isn’t perfect either. The siblings have been spending most days over the past few months watching educational television and listening to educational radio programmes in an attempt to keep up their schooling. Since joining their mother in Nkomazi, in northeastern Mpumalanga, Nsikelelo and Samkelisiwe have not been…