Dyfed Powys Police say they are investigating the 'sudden deaths' of a mother and daughter at their home in Builth Wells.
In a statement they said that the bodies of the two women aged 107 and 69 were discovered shortly before 10am on Monday 8th April.
Police say that post mortems have taken place and that inquiries are continuing.
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Feeling humid with heavy showers and thunderstorms moving north overnight into Sunday.
Four people, including three children, were taken to hospital to be checked for smoke inhalation.
Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.