Three people have died in a Sydney home, with police saying they are believed to be the parents and brother of a 32-year-old man who has been arrested. New South Wales police arrived at the house in Rosemeadow in Sydney’s south-west on Sunday just after 1.30am after reports of an assault. A woman, 65, and a man, 25, were found dead at the scene. A man aged 64, found with critical injuries, was treated by paramedics at the scene but later died in hospital. They are believed to be the parents and brother of the man in custody. Rosemeadow Map showing where Rosemeadow is located. Supt Grant Healey, commander at Campbelltown city police area command, said it appeared those involved were all family members. A third son, aged 30, who was also injured during the incident, was taken to Liverpool hospital where he was treated and discharged. Police suspect there could be more than one type of weapon involved, based on the injuries. No firearms were involved.…