South Wales Police say they now believe the two bodies found in at an address in Merthyr Tydfil were a mother and young child.
Detectives are treating the deaths as unexplained and the bodies have not yet been formally identified, police added.
Police have cordoned off the scene where the bodies of an adult and a child were found in Merthyr Tydfil as they make house-to-house enquiries.
Police are investigating after the bodies of an adult and a child were found at an address in Merthyr Tydfil.
Police found the bodies after they were called to the address this afternoon.
When a British holidaymaker was filmed grappling with a shark in Australia, the footage went around the world and Paul Marshallsea was hailed a hero.
But back in Britain, when his bosses watched the video they did not have quite the same reaction. Mr Marshallsea was on sick leave - and has now been sacked for breach of trust.
ITV News reporter Nick Thatcher:
A Welsh grandfather who was hailed a hero after pulling a shark away from children on a beach in Queensland says he has now been sacked from his job, because he was on sick leave when he made the brave intervention.
Paul Marshallsea from Merthyr Tydfil says he was shocked to return home from Australia to find he was being dismissed from his job working with young people, after bosses saw footage of his encounter with the shark.