 The two children born to them are Ada and Ingrid; Ada is a social worker at the Leeukop Prison, Johannesburg, and Ingrid works as a librarian in the University of South Africa.Plug then continued her studies in anthropology and archaeology at the University.She finished her studies in anthropology up to third-year level, and archaeology to second-year level as at that time the university provided college education in these subjects to that level only.