Who was your grandfather Roméo Joseph Hamelin married to? (the bride's maiden name is needed) And do you know where and about when?
If you're just starting RJ (?), you should know that the spouse's name is very important in finding the correct Roméo Joseph. In time, you'll find that ancestors may have lived as, say "Romeo" or even "Romeo Joseph" but may have been married as "Joseph". So, having the spouse's maiden name becomes very important in finding him.