Kwame Fosu, 29, was handed down the punishment after he pleaded guilty to the charge of causing harm.
Police Detective Sergeant Princeton Peasah Darkwa told the court that the incident happened at Dampong in the Asante-Akim South District on September 22, last year.
The victim, Anthony Kwakye, returned to the house from town at about 2000 hours on September 17, only to find to his disbelief, the convict, subject his (Kwakye) biological mother to a beating and rushed to her rescue.
Fosu, threatened to deal with him at the appropriate and followed through with the threat five days later, when he attacked him with a pair scissors – stabbing him in the right rib.
Some people in the neighborhood went to his aid and a formal report was made to the police.
The victim received treatment at the Bompata Health Centre.