By Andrea Mayes, ABC News
Photo: ABC News / Keane Bourke
The scene that greeted first responders at a house in the riverside suburb of Mosman Park was in police's own words "highly distressing".
An entire family dead in their own home - a mother, a father and their two teenage boys.
A "devastating tragedy" is how Detective Acting Inspector Jesscia Securo put it, addressing the media just three hours after the awful discovery was made.
So what do we know about what happened?
Photo: ABC Ne
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