Two adults and two teenage boys have been found dead in a suspected murder-suicide at a home in Perth's west. Police were called to the house at Mosman Park about 8.15am (AWST) after a person known to the family became concerned for their welfare. READ MORE: Man killed after bulldozer rolls at Port of Brisbane worksitePolice at the scene of a major incident at Mosman Park. (Kelly Haywood/9News Perth)Police said the four were part of a family unit, and they were aware that the children had experienced "significant health challenges". Securo said no weapon was during the incident and the family had no reported family violence matters and were not known to police at all.