A 54-year-old grandfather who helped his family members beat up a man at a coffeeshop was on Thursday jailed for 17 months, in a case the court described as straight out of an action movie.

Roslan Zainol was part of a group of six that confronted the victim, 53, in a coffeeshop at Chai Chee Road on Jan 18 last year. This was after Roslan's brother, 50, had earlier picked a fight with the man, but the coffeeshop's owner had intervened and broken it up.

Roslan's son struck the victim twice with a wooden pole, which broke into two after the first blow, while Roslan threw a glass mug at the man and kicked him after he had fallen to the ground.

Their victim was left with injuries, including a nose fracture and bruises.

Roslan's punishment, which was decided after the court took into consideration two other charges of voluntarily causing hurt and affray, includes a 10-month jail term for rioting in May 2013.

Roslan's son was sentenced to seven months in jail for his role in the attack at the coffeeshop.

Roslan's criminal record, which includes a long history of drug addiction, started when he was 20 years old.

For voluntarily causing hurt, he could have been jailed up to two years and fined $5,000.