The youngest son was born in 1874 and died 1944. His Death Notice, section were parents name is recorded was not completed , either by the person who filled in the form, or the person who provided the information. His age is given as 69 years 7 months which corresponds with that which I calculated as 69 years 7 months 27 days.
Assuming the father died at 70 years, there is no Death Notice in any of the Archives that could be matched. What I did notice was that in the section were the parents name is normally filled in someone wrote in pencil the following. "Word nog nagespoor" When translated into English it means " It is being tracked". The search continues!