Zandile Tshuma, 42, and their daughters, Nala, 5, and Natalie, 15.
South African police said they arrested a UK father in Johannesburg on Friday, suspected of murdering his wife and two young daughters.
Ndodana Mkhanyisi Tshuma, 45, was arrested following an operation involving Interpol, the South African Police Service (SAPS) statement said.
"Through swift operational coordination and intelligence-led policing, SAPS members successfully traced and arrested the fugitive today," it said.
Ndodana Mkhanyisi Tshuma left the country via Heathrow Airport on Saturday
