Police say two siblings may have been dead in a Brisbane home for some time before their bodies were discovered.
Detectives found the bodies of a 54-year-old man and a 58-year-old woman in separate bedrooms at a home in Macbeth Place at Sunnybank Hills just after 2.30pm on Tuesday afternoon.
Police said that the bodies may have lain undiscovered for some time before finally being noticed by their frail 89-year-old mother, who lived with them at that address.
Police said there were no obvious signs of death, and that autopsies and further forensic examinations would be conducted.
They said it was too early to determine whether it was a murder-suicide, but that mental health issues would form part of the investigation.
The siblings' mother has been taken to hospital for assessment.