The quick thinking of a brave neighbour may have saved the lives of a Perth mother and her son during a terrifying gun and knife rampage.

Louis Williams phoned triple-0 and tried to distract a man who has now been charged over the attack.

WATCH THE VIDEO ABOVE: Neighbour’s quick thinking saves family from armed attack

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“I awoke to some banging on the Colourbond and then I heard some glass shatter,” Williams said.

He came face to face with the accused attacker in Huntingdale, in Perth’s southeast, on Thursday.

“I started making a ruckus outside so basically making a loud sound saying oi. He then replied back that he had a gun. I couldn’t see the gun, but I didn’t know if he did have a gun at the time so basically went back inside to go tell triple-0,” he said.

The man’s alleged targets were his former partner and their 24-year-old son.

Louis Williams called triple-0. Credit: 7NEWS

Emergency services at the scene. Credit: 7NEWS

The pair were seen outside their home with stab wounds to their hands after fighting back.

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“The man was coming forward to the woman and to the boy and honestly very impressed by you know the boy and the mother in terms of stepping in front. And you know making sure protecting the mum honestly astounded in the bravery of him,” Williams said.

“She was pleading with him to stop please stop please stop you know and they were putting their arms up defensively. So they were looking after themselves as well.”

Police arrived within six minutes, red and blue lights lighting up the street.

Neighbours say they witnessed the alleged attacker approaching the neighbourhood, with police homing in on the vehicle.

The mother and son after the alleged attack. Credit: 7NEWS

Williams says he is just a neighbour. Credit: 7NEWS

The son injured in the ordeal told 7NEWS his family wants to thank emergency services and neighbours who raised the alarm.

“We are deeply grateful for the compassion, courage and support shown by those who helped and for the many messages of concern, prayers and kindness,” he said.

His mother is still recovering in hospital.

His father, who’s accused of the attack, has been charged with 19 offences.

“I’m just a neighbour. You know just doing what a neighbour would do,” Williams said.