A woman stayed home from her husband's funeral out of fear of her son ... who then put a machete through her door.
He then ended up in a standoff with cops while armed with the weapon, saying they would need "more than five of yous" to take him.
John Garvey will now be behind bars for more than three years.
The 31-year-old's father died in January and his funeral was set for February 5.
Dumbarton Sheriff Court heard on March 31 that due to his behaviour and "unpredictable state", his mother "did not feel comfortable attending her husband's funeral due to safety".
She stayed home throughout the day.
At 9pm, a neighbour who had known Garvey since childhood, saw him running up a path on Erskine View, Old Kilpatrick, towards his mother's property in Dumbarton Road.
He was armed with a brown-handled machete.
"John, what the hell are you doing?" he shouted.
Garvey ignored him and ran towards his mother's rear kitchen door, hitting it multiple times with the machete, shouting, "you're a f***ing slut".
He stabbed through the white PVC door with such force it went through and left a five-inch slice through the middle.
The court was told he put it through at head height without knowing if anyone was standing behind it.
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He then smashed both kitchen windows and made off.
His mother heard "multiple thuds which frightened her", said fiscal depute Maria Murdoch.
She went down and saw the broken glass. The neighbour called police and the mother was found upset and shaken.
Police went to Garvey's home in Erskine View and saw he was standing in the living room with the windows open, armed with the machete.
He charged toward the window shouting: "Don't yous come any f***ing closer or this is going through the lot of yous. I swear to god, I will kill yous.
"I can f***ing see your taser, let's f***ing go then."
Police tried to negotiate with him for about 20 minutes. He kept shouting and threatening officers.
Eventually he agreed to stand down and threw the machete towards police.
Cops gained entry but Garvey immediately started shouting again.
"You f***ing c**ts, I was going to make this easy for yous but yous will need more than five of yous now," he said.
He was arrested.
And on March 31 he pleaded guilty to having a machete, and striking a door with it to the danger of lieges.
Garvey further admitted to uttering derogatory remarks and breaking two windows at his mother's home. And at his home, he shouted, swore, uttered threatening remarks to police while having a machete.
He was on bail at the time of the offences and was breaking a curfew.
Defence solicitor Paul Sweeney said his client had been taking drink and drugs since the age of 11.
When interviewed by social workers, Garvey admitted criminality beyond what's in his record of convictions.
He explained his client had learned information about his parents after his father's death. Then he consumed alcohol and valium on the day of the funeral.
"He fully accepts there is no excuse, whatever was going on between his mother and father," said Mr Sweeney.
"There has been no contact with his mother since. I don't see that changing.
"His head was all over the place."
His lawyer said there was a drop off in offending between 2019 and 2023.
"He does want to make a better life for himself," he added.
Garvey previously pleaded guilty to a second case of an assault outside the Asda in Dumbarton. The July 26, 2024 attack left his victim unable to eat solid food for a month.
He was sentenced for both on March 31.
Sheriff John McElroy KC jailed Garvey for a total of 46 months, backdated to February 6.
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