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.
Troedyrhiw is a close-knit community in Merthyr Tydfil and local people are obviously shocked.
We have a team of officers at the scene and in the community looking for information that may assist our enquiries.
We would like to hear from anyone who has seen or heard anything suspicious or unusual in Church Street in recent weeks.
More top news
A restaurant is facing a backlash after a diner was seemingly sworn at by the company when she posted a complaint on their Facebook page.
Debris found on the island of Reunion has been confirmed by a French prosecutor as being a wing part from missing airliner MH70.
The father of the drowned Aylan Kurdi said he tried to save his family as they clung to the upturned boat in the Mediterranean.