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A man has been charged with three counts of murder and one of attempted murder after allegedly attacking his family members in a Sydney home.

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, died at the scene. A man aged 64 was found with critical injuries and 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.

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.

Healey said the surviving family member had made the call to police.

On Sunday evening, police said the 32-year-old man had been charged with three counts of murder (domestic violence) and one of attempted murder (domestic violence). He has been refused bail and will appear in Cambelltown local court on Monday.

Police suspect there could be more than one type of weapon involved, based on the injuries. No firearms were involved.

Police were “confronted with a very bloody scene”, Healey said.

“Blunt force trauma is always horrendous for people to confront, and any edge weapon attack is always horrendous to confront.

“The information we have at the moment, the family weren’t known to us. This is a very tragic incident and there was no way for us to predict this type of thing was going to occur.”

• This article was updated on 3 May 2026 to correct the age of one of the men who died after clarification from NSW police.