I'm going to work today on trying to set up a template for the Ngubengcuka Vusani aNdaba, Parallel King of the abaThembu descendants - because these descendants split into the abaThembu kings as well as Mandela's lines. (Somewhat in dispute, of late :-)
I built the tree last year or the year before - but the very recent lines are largely from online sources & Mandela's autobiography, not history books.