A man accused of murdering his parents and younger brother will face court, as friends remember the youngest boy as ‘bright’ and ‘kind’.

Jacky Amazing Feng, 32, allegedly attacked his parents and two brothers with a hammer in a drug‑induced frenzy at their family home on Juliet Close in Rosemeadow, southwest Sydney, shortly after 1.30am on Sunday.

His mother, Ruvena Lam, father Zhou Chao Feng, and youngest brother, Justin, 25, died from their injuries.

The couple’s middle child, Jason Feng, 30, survived the alleged attack and managed to contact emergency services.

NSW Police will allege Feng left the scene after the alleged murders and returned an hour later to find police and paramedics swarming the property.

Feng was charged with three counts of murder (DV) and one count of attempted murder (DV) on Sunday night.

He was refused bail and is set to appear in Campbelltown Local Court on Monday.

A man who has known Justin since they studied engineering together at University of Sydney, told the Daily Mail he was devastated to hear about the tragedy.

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Jacky Amazing Feng, 32, was charged with the murders of his parents and younger brother, Justin

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The body of 25-year-old Justin Feng was found in the granny flat at the rear of the family home

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Feng (right) pictured with his younger brother Jason who survived the attack

‘Justin was a kind person who I enjoyed spending time with,’ Jishnu said.

‘He was a sweet person and a good friend he will be missed greatly.’

Justin was also described as the ‘smartest guy’ by a high school friend.

‘RIP to Justin and his family,’ he wrote.

‘Went through school together, was always a bright guy, smartest guy as well, gone too soon!’

Emergency services were confronted by a ‘very grisly crime scene’ upon their arrival, with sources suggesting the alleged killer was affected by drugs.

‘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 said.

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

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The bodies of the victims were removed from the family home on Sunday afternoon

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Police removed a silver Subaru sedan from the street, which appeared to have blood on one of the handles

Superintendent Healey said the family were not 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.

Supt Healey earlier said police believe more than one weapon was used during the deadly attack – one that would cause ‘blunt force trauma’ as well as a ‘bladed weapon.’

No firearms are believed to have been involved.

‘Police were confronted with a very bloody scene. Blunt force trauma is always horrendous for people to confront, and any edged weapon attack is horrendous to confront,’ Superintendent Healey said.

‘So police and ambulance did a fantastic job in very trying circumstances.’

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

One neighbour, who knew Jacky Feng, said ambulance crews had attended the home several times in the past year.

Another neighbour said he was awoken at 1.30am by 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 removing 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 trolleys were wheeled into the premises.

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