Jasjit Sandhu, 37, was a passenger on the truck that went into the Nith River last Tuesday.
The truck was carrying a full load of laptop computers when it skidded off Highway 401, west of Cambridge, Ont.
It was en route from the city of Mississauga, Ont., to Chicago at the time of the crash.
Sandhu was killed along with the truck's driver, 38-year-old Anand Vora.
Both victims were from Brampton.
On Sunday, Satbir Sandhu told CBC News that his cousin's passing was going to be tough on the family he left behind.
"They are holding up, but it is very, very difficult. It’s devastating for the family," Sandhu said, noting that his cousin had left behind two young children.
"It's not going to be easy for his wife and the kids," he said.
Mourners, some of whom came from as far away as Australia, spent Sunday afternoon in Brampton for the 37-year-old's cremation.
The Ontario Provincial Police are still investigating the cause of the tragic crash that claimed the lives of the two men.