nickd: Are you looking for something like this?
Cybergangster: I worked at Maccas years ago and there were plenty of options. In the kitchen you could be cooking the food, assembling burgers or preparing the fries. You've also got customer facing roles such as cashier, or support. Otherwise, you could work on maintenance (early starts, more cleaning based than maintaining) or serve in the restaurant, clearing spills and wiping tales. If your cousin has experience (and a valid work permit) then he shouldn't have too much difficulty finding a job.