Surrey Police officers were called by South-East Coast Ambulance service to a property in Bremer Road, Spelthorne in Surrey at around 1:15pm on Saturday (31 August) where they sadly found the bodies of three children and a man.
An investigation is being carried out to establish the circumstances of their deaths.
At this stage, police believe this to be an isolated incident with no third-party involvement.
Their next of kin are aware and will be supported by specialist officers. Police request their privacy is respected at this difficult time.
Bremer Road is currently closed.
Chief Inspector Lucy Sanders said: “This is a tragic loss of life in our community and we are working to establish exactly what has occurred.
“There is currently a significant police presence at the location, and in the surrounding area, and we would like to thank local residents for their patience and understanding whilst we conduct our investigation.”
Surrey Police have also completed a mandatory referral to the Independent Office for Police Conduct (IOPC) due to previous police contact with those involved.