Mai Mach was found dead in her Albanvale home with her grandson. Alistair's mother, Amy, and his father live in Maidstone. It is understood that he was their only child. A 45-year-old Albion woman was arrested on Tuesday night. A witness told Channel Seven that he had seen a woman standing over another woman with a large garden tool.

"It looked like garden scissors, maybe half a metre long," he said.

A tribute to the dead in Albanvale. Credit:Simon O'Dwyer A friend of the slain boy's mother laid the flowers and toy near the crime scene on Wednesday afternoon. The distraught woman remembered Alistair as a "lovely boy", who often played with her own child. Police at the scene of the Albanvale double murder. Credit:Simon O'Dwyer Relatives and family friends arrived to pay tribute.

"I'm the sister-in-law and I've just seen it on TV," one woman said. The suburban street in Albanvale, cordoned off after the grisly discovery of the bodies of a grandmother and her grandson. Credit:Darrian Traynor The neighbour directly behind the Machs, Sunalp Berkant, said his children heard the sounds of screaming yesterday afternoon. He said they were "good people". A policeman at the scene of the murder. Credit:Darrian Traynor

"I'm telling you, this thing that has happened, I'm not accepting," Mr Berkant said. "He is a very good man and she's a very good person too." A family friend posted a tribute to the slain boy on Facebook. "How can such tragedy happen... such a sad sad day. Rest in peace my little boy. Your hugs kisses and love will be dearly missed. Thank you for all your laughters and cuteness Alistair... God bless you both." A friend of Alistair's mother said the boy was "bubbly, outgoing and loves to talk. He is just adorable," Mandi said. "I'm so upset that he is gone now. Never would I have expected this coming."



Homicide Squad Detective Senior Sergeant Stuart Bailey said police believed the relationship between the 45-year-old arrested womanand Mr Mach may have been a motive for the fatal stabbings. "We believe it's got something to do with the relationship between [them]," he said. "They've know each other for three years. The nature of that relationship is yet to be uncovered." Senior Sergeant Bailey said a romantic relationship was an angle being being looked into, among others. "The actual motive is yet to be established," he said.

Senior Sergeant Bailey said said the boy's parents were "inconsolable and devastated" and were being looked after by police. The grandparents cared for the boy while his parents were at work every Tuesday. Police believe the 45-year-old Albion woman came to the Albanvale home some time in the morning. They believe Ms Mach was fatally stabbed in an "altercation" when she returned home on Tuesday afternoon. Paramedics treated Mr Mach for minor injuries at the scene, and he was taken to the Royal Melbourne Hospital.

Senior Sergeant Bailey said the scene was "extremely distressing" for police. "The scene is quite horrific," he said. "It's quite stressful for police and crime scene services that are here." He said he could not comment on whether a weapon had been found. Several witnesses are assisting police with their inquiries. No charges have yet been laid.

Senior Sergeant Bailey said no previous domestic violence incidents had occurred at the property and there were no known prior convictions of any of the people involved. Neighbour Shelley Meaney, 19, who lives a couple of doors down from the house, said the family had seemed "normal". "I spoke to them a couple of times and they seemed nice," she said. "There were no arguments or anything." Ms Meaney said a lot of visitors - perhaps family - came to the house, where they had not lived long. "I almost burst into tears when I found out," she said. "It's our street."

Twins Nikki and Amy Brook, 21, who live in Concord Circuit, which crosses with Varsity Court, said they were in shock. A neighbour told them he had heard the sound of whips coming from the woman's house shortly before police arrived. "Yeah, like bang, bang. It's a bit weird," Amy said. "It's scary knowing that there was a kid involved." As the news broke, neighbours gathered near to where the police cordoned off a section of the Concord Circuit, all in disbelief at the news.

A woman, 38, who also lives in the in the circuit, but did not want to be named, said it was unsettling. "It's not a safe area. It's getting worse," she said. Her 59-year-old mother said she had gone cold. "I was just cutting the lawn and I find out this," she said. "It's not safe around here." However, a husband and wife, both 66, who live around the corner, disagreed.

"It's very hard, because it's a safe area," the woman, who also didn't want to be named, said. "I've lived here for 20 years and nothing." Anyone with any information is urged to call Crime Stoppers on 1800 333 000. With Marissa Calligeros