A couple of things
1) I bet it is a Portuguese G3 (this is base on my knowing the fact that the Portuguese gave a lot of aid to Rhodesia via Mozambique and not my ability to discern the difference and I stand by to be corrected)
2) Based on the caption they are in Zimbabwe, not Rhodesia... so the picture would have been 1986ish- though certainly the old dude would have fought in the war and he held out longer than most
3) The family ended up emigrating- ended up in New Zealand. I actually found the kid on FB (long story) I did not talk to him or anything
4) The image of the old man has become my defacto image across all social media because- I love the warning the picture makes, he doesn't look whole unlike me, and the fact that I do the same shit with my son