There are ALWAYS fractures inside the ANC - see COPE and the saga of Julius Malema as 2 reasonably recent examples. When a party includes a huge array of different views, this is understandable. Zuma is, and is seen as, a very weak leader. Cyril Ramaphosa was bought in as ANC Deputy last year...
Well, we will have to wait and see. There is a LOT of scaremongering which has been going on for years about what will happen when Madiba dies. This is often perpetrated by those who want it to happen, to justify their views (am not saying this is what your cousin thinks, by the way). It does...
Precis please - cannot watch it obviously! But if it is as a result of the ANC's failures to do anything about poverty, unemployment and education, then I am not surprised - there are often violent protests about that here.
Not sure it can be described as a Tinderbox though, just yet.