The 22-year-old was sentenced in the County Court after pleading guilty to two charges of intentionally causing serious injury, criminal damage, contravening and family violence intervention order, and committing an indictable offence on bail.

Last July, the man went to his mother and stepfather's central Victorian home with a cut hand, claiming he had been stabbed.

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However, he sustained the injury when he smashed a window and kicked in a door at a nearby home.

While his mother and stepfather attended to his injury and called for an ambulance, the man tried to get some alcohol from the fridge.

When his stepfather told him to leave it alone, he rushed at the older man and began punching him.

His mother tried to go to the aid of her partner but the man turned his attack on her, punching her to the head.

Both victims fell unconscious, and the court heard the assault continued on them afterwards.

Two people arrived at the house and heard the offender yell, "You are f***ing c***s" and "I'll f***ing kill ya".

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Through the open front door they saw him grab some knives, but slip and drop them.

He then grabbed his stepfather - who was unmoving on the ground - and continued to yell abuse at him.

The two people entered and the offender was taken out of the house, before he ran away.

The stepfather suffered lacerations to his head, bruising to his face and upper body, multiple rib fractures, fractures to the transverse processes of two vertebrae, a fracture to the hand, and a fracture to the shoulder region of his upper arm.

Two of these fractures required surgery.

Meanwhile, the offender's mother suffered facial and head bruising, wounds to her inner elbow, loose teeth, and a fractured ankle that had to be operated on.

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At the time of the attack, the offender was on bail and subject to a family violence intervention order that prohibited him attending their home, due to an earlier assault against his stepfather.

He was also intoxicated.

In sentencing, Judge Trevor Wraight took into account two victim impact statements, which detailed the ongoing physical and mental impact of the attack, including the adverse effect on their relationship and their continued fear of the offender.

Judge Wraight noted the attack followed a period in which the offender had broken up with his long-term partner, become homeless, experienced the deaths of family members, and increased his substance abuse.

A psychologist reported that the man had severe and ongoing anger management issues, and limited skills to manage conflict.

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Judge Wraight said the man had a limited, but relevant prior criminal history.

But he noted references from the man's uncle and former partner's mother spoke of a different side to the offender, describing him as warm, intelligent and respectful of others.

The judge said a letter the offender wrote to the court, in which he apologised, was sincere and showed he was on the start of his path to rehabilitation.

Judge Wraight also took into account his guilty pleas, his young age, the impact of COVID-19 on prisoners and the support of the man's wider family, although he regarded his prospects of rehabilitation as "guarded".

The man also had to be sentenced as a serious violent offender.

Judge Wraight sentenced the man to a maximum six and a half years' imprisonment, with a non-parole period of three and a half years.

He had already served more than 430 days at the time of sentencing.

But for his guilty pleas, the man would have faced at least five years in prison, with a maximum sentence of eight years.

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