Rahman, a father-of-one, reportedly died a week after a physical altercation with the Evans family in Owen Sound, about 118 miles (190km) from Toronto.
The incident allegedly took place in the street outside a curry house following an argument over an unpaid $150 (£79) bill.
Rahman was found in the street by a staff member and later died in hospital in London, Ontario.
At the time Canadian media outlets reported the three were in the country on holiday visas and left a short time after the altercation.
More than a year later, Evans Jr and his father were arrested by Police Scotland in Edinburgh while his uncle was arrested in Dalkeith.
CBC, a partner of the BBC, reports the men are all originally from Manchester.