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.
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A judge ruled the boy may be allowed home from Alder Hey Children’s Hospital, but will not be allowed to go to Rome for further treatment.
Alek Minassian, 25, has been charged with first degree murder.
The president, meanwhile, thanked the French leader for his “steadfast partnership” in the recent missile strike in Syria.