Three people have died and a man has been arrested after a violent incident at a family home in Sydney’s south-west overnight.

Emergency services were called to Juliet Close in Rosemeadow just after 1:30am on Sunday, where police discovered the bodies of a woman in her 60s and a man in his 20s.

Police and investigators in a group on the front lawn of a house surrounded by police tape.

Three people have died after a violent incident at a family home in Sydney’s south-west. (ABC News)

A 64-year-old man was also found at the scene with critical head injuries and later died at Liverpool Hospital.

An hour later, officers arrested a 32-year-old man who arrived at the scene.

He has been taken to Campbelltown Police Station.

Two investigators in protective suits search the contents inside the boot of a hatchback.

Emergency services were called to Rosemeadow early on Sunday morning. (ABC News)

Police believe the incident is domestic violence-related, but the direct relationship between the people has not been confirmed.

The homicide squad will assist the police investigation as it continues this morning.

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