In 1970 he married Marianne, a Swede, and they were blessed with a son Dzikamani and later, a daughter, Johanna. The first born of eight, Nganunu was primarily raised by his mother since his father left to work in Bulawayo, Zimbabwe when he was very young. Like most children did at the time, he herded cattle and grew crops.
Nganunu is a hardworking, determined and positive soul. In 1949, at the age of eight, Nganunu went to Mapoka Primary School to do sub A, sub B and then standard 1- 6. In 1958 he went to St Joseph's college to pursue his junior and secondary education. When he was reading for form 4 in 1961 he was expelled from school because he had taken part in a strike that was about the student's welfare particularly the food and the behaviour of the boarding master. Nonetheless in March 1963 he continued with school and combined his form 4 and 5 completing at the end of that year. The dignitaries that Nganunu went to school with include amongst others Vice-President Ponatshego 'PHK' Kedikilwe and Founder Chairman and CEO of Botswana Telecommunications Authority (BTA) Moses Lekaukau.
