You probably already have this information by now, since your post is about 13 years old!!!!
There was a Malcolm McLaren who was baptised at "St. Andrew's Presbyterian Church, Williamstown, Glengarry County, Ontario", on 5 July 1795. He was the son of Hugh McLaren and Anne MacKay. They were residents of Charlottenburg, Glengarry County. Hugh and Anne also had a son named Angus and daughter Janet. Both Janet and Angus were baptised at St. Andrew's on 10 July 1791.