The incident happened last summer in the village of Etne, TheLocal.no reported Friday.
Sturla Vik-Vestly, a lawyer for the victim, told TheLocal.no the man decided to demolish his older brother's home after hearing rumors that he planned to knock down an older house on the family property that the younger brother believed he had a right to live in.
"His way of reacting was totally crazy," Vik-Vestly said. "You don't tear down a house because you hear some rumors."
The older brother and his 16-year-old son were in the house when the suspect began tearing down walls with the forklift, Vik-Vestly said.
Along with the jail time, the younger brother has been ordered to pay $164,000 in damages to his older brother, and received a five-year driving ban for drunken driving while fleeing the scene.