Grim new details have emerged around the deaths of three people in a family home in Sydney‘s south west overnight as a man remains in police custody.

Police said the couple in their 60s and two of their sons were attacked at the home on Juliet Close, Rosemeadow just after 1.30am on Sunday.

Emergency services were called to the home following reports of a violent assault however were confronted by a ‘very grisly crime scene’ upon their arrival.

‘Police first encountered a 65-year-old woman and started doing first aid on her… police went inside the house and found a 64-year-old male who was still alive with serious blunt force head injuries,’ Campbelltown Commander Superintendent Grant Healey told reporters on Sunday morning.

‘They found a male deceased in a granny flat at the rear of the premise.’

It’s understood the man was the family’s youngest son, who was 25-years-old.

Superintendent Healey said another brother, aged 30, contacted emergency services after he was assaulted. He was taken to Liverpool Hospital and was released after receiving medical treatment on Sunday morning.

Officers arrested a 32-year-old man an hour after the grim discovery when a silver sedan pulled up at the scene.

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Grim new details have emerged around the deaths of three people in a family home in Sydney’s south west overnight as a man remains in police custody

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Police said the couple in their 60s and two of their sons were attacked at the home on Juliet Close, Rosemeadow just after 1.30am on Sunday

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Superintendent Healey said another brother, aged 30, contacted emergency services after he was assaulted

The driver of the car, who is believed to be the couple’s eldest son, was taken to Campbelltown Police Station where inquiries are continuing.

When asked by reporters if the man would be charged today, Superintendent Healey said: ‘It’s still very early. We have a few things to run through’.

He said the family, who are Asian-Australians, were not well known to police.

‘This is a very tragic incident, there was no way for us to predict this type of thing was going to occur,’ he said.

‘This is an incredibly rare incident and it’s incredibly tragic.’

Superintendent Healey said police believe more than one weapon was used during the deadly attack, including a bladed weapon and one that would cause ‘blunt force trauma’, which he agreed may have been a hammer.

No firearms are believed to have been involved.

As police worked to tow away the silver sedan on Sunday morning, shocked neighbours told the Daily Mail the family mainly ‘kept to themselves’.

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The bodies are carried out of the home at Rosemeadow on Sunday afternoon

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At 2.35pm a white Coroner’s van arrived in the street and reversed into the driveway of the home

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As police worked to tow away the silver sedan on Sunday morning, shocked neighbours told the Daily Mail the family mainly ‘kept to themselves’

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One neighbour, who knew the family’s eldest son, said ambulance crews had attended the home several times in the last year

One neighbour, who knew the family’s eldest son, said ambulance crews had attended the home several times in the last year.

Another neighbour said he was awoken at 1.30am by the sounds of what he thought was ‘a car chase.’

‘Then all the emergency cars came and a silver Subaru returned to the street. Someone said they saw a man hold up his hands as police approached him,’ he said.

As investigations continued into Sunday afternoon, forensic officers were seen taking a thermal imaging camera into the house and transporting evidence from the scene.

At 2.35pm a white Coroner’s van arrived in the street and reversed into the driveway of the home.

Two empty stretcher trollies were wheeled into the premises.

Over the next 15 minutes the trollies, each loaded with a body, were wheeled out and placed into the white van which left the scene just before 3pm.

Anyone with information about this incident is urged to contact Crime Stoppers on 1800 333 000.

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Police found the bodies of a couple in their 60s and their 25-year-old son at the home on Juliet Close, Rosemeadow just after 1.30am on Sunday

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Police removed a silver Subaru sedan from the street, which seemingly had blood on one of the handles

The body of the youngest brother was found at the granny flat at the rear of the home

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Forensic officers swept the boot of the silver sedan in the early hours of Sunday morning