A man has been charged with murder after allegedly attacking his mother, father and younger brother.

Police will allege Jacky Feng, 32, attacked his parents and two siblings at their family home on Juliet Close in Rosemeadow, southwest Sydney, around 1.30am on Sunday.

The second brother survived the ordeal after Feng allegedly used a hammer or similar blunt weapon in the brutal attack.

It’s alleged Feng left the scene before returning an hour later to find emergency services at the property.

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

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

Emergency services were called to the home on Sunday and immediately faced a “very grisly crime scene”.  

First responders first located a 65-year-old woman deceased, before finding a 64-year-old man suffering blunt force head injuries still alive inside the building.

They then found the body of a 25-year-old man, inside a granny flat at the home.

The injured 64-year-old man was taken to Liverpool Hospital before dying later Sunday morning.

Another family member, 30, was taken to hospital for treatment. He has since been released. 

Campbelltown Commander Superintendent Grant Healey told reporters on Sunday morning first responders were confronted with a “very bloody scene”. 

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

“The police and ambulance do a fantastic job in very trying circumstances.”

Superintendent Healey said police suspected more than one weapon was used during the alleged attack. 

A bladed weapon is believed to have been used in tandem with one that could cause “blunt force trauma”, possibly a hammer, Superintendent Healey said.

“It’s a very extensive crime scene so we haven’t recovered a weapon at the moment… we are systematically working through the granny flat out the back and then we go through the house,” he said.