Mymensingh District and Sessions Judge Md Helal Uddin announced the decision over the case at Bhaluka Police Station at 12:30 am on Monday.
The convict has also been fined Tk 10,000.
Advocate Kabir Uddin Bhuiyan, a public prosecutor at the court, represented the state in the case.
On Dec 23, 2018, Mustafa hacked his mother with a chopper over a land dispute in the Dugulia neighbourhood of Bhaluka Upazila’s Jamirdia. She died at the scene.
Another son of the victim, Md Shah Jalal, filed a case over the incident that day, accusing five.
After an extended investigation, the chargesheet in the case was submitted on Feb 12, 2019 and named Md Mustafa.