A Sydney man accused of murdering his parents and brother has been refused bail, with his case adjourned to allow time for a psychiatric assessment.

Jacky Amazing Feng, 32, faced court for the first time on Monday, following the alleged murder of three family members and the alleged attempted murder of another brother on Sunday morning.

Mr Feng appeared on-screen in Campbelltown Local Court via video link, where Judge Peter Thompson adjourned the case to July 15, and ordered a psychiatric assessment while the accused remains behind bars.

the feng family look at the camera, the father, mother and one of the brothers were allegedly murdered by a family member

Mr Feng (back, right) pictured with his father Charles, mother Ruvena, and brother Justin. (Supplied)

Lawyer Javid Faiz, who is representing Mr Feng, told reporters outside court it was a “tragic incident”.

Mr Faiz said he had not made a bail application for Mr Feng, but would do so “once all the brief materials have been provided”.

Bail was formally refused.

A ‘very bloody scene’

About 1:30am on Sunday, police and ambulance paramedics were called to a home on Juliet Close, Rosemeadow, in Sydney’s south-west, following reports of an assault.

When emergency services arrived, the bodies of a 65-year-old mother and her 25-year-old son were found.

Police said a 64-year-old father was suffering from “serious blunt force injuries”. He was taken to Liverpool Hospital where he later died.

A second son, aged 30, also sustained serious injuries, but managed to dial Triple Zero (000).

Police and investigators talk outside a brick home as neighbours watch from outside the taped-off area.

Officials were seen wearing protective gear at the site. (ABC News: Liam Patrick)

Police allege that about an hour later, Mr Feng, the eldest son of the family, arrived at the home in a silver car, and was arrested at the crime scene.

He was charged on Sunday evening with three counts of murder (DV) and one of attempted murder (DV).

On Sunday, Superintendent Grant Healey said emergency services were confronted with a “very bloody” and “grisly” scene.

He said that police suspected that more than one weapon was used, including a bladed edge and potentially a hammer.

DV ‘can no longer be a silent crime’

NSW Police Minister Yasmin Catley offered condolences to the family and friends of the Feng family.

“This is a terribly stressing case,” Ms Catley said.

“I also want to extend that to the first responders. I can’t imagine what it must have been like for those first responders.”

Chris Minns and Yasmin Catley

Ms Catley says it’s “a terribly stressing case”. (ABC News: Monish Nand)

Ms Catley said communities had a responsibility to call out domestic and family violence, with an increase in DV-related deaths across the state.

“It can no longer be a silent crime … Let somebody know if you think something is not right, because we are seeing too many domestic and family violence deaths.”

Family friend ‘shell-shocked’

Jonathan Dalangin, a friend of Mr Feng, attended the local court with concerns for the family.

“I was a bit shell-shocked when I first heard it … didn’t really believe it,” the 32-year-old said outside court.

Jonathon Dalangin a friend of the feng family speaks outside campbelltown court

Mr Dalangin described the Feng family as “quiet” but “good”. (ABC News)

Mr Dalangin said he went to high school with Mr Feng, and the pair had completed a plumbing apprenticeship together.

“He was an A-class student, a top student in Ambarvale High School.”

He said he received a text from a friend on Sunday morning which said: “Jacky Feng might be in trouble.”

He described the Feng family as a “quiet” but “good family”.

Mr Feng remains behind bars and will undergo a mental health assessment before he is next due before the courts in July.