John's role in "Step Brothers" was Brennan Huff, a successful businessman who is the adoptive brother of Dale Doback. Brennan is a foil to Dale, as he is everything that Dale is not: successful, wealthy, and popular. Despite their differences, the two brothers eventually learn to get along and even become friends.
The Remarkable Journey of John C. Reilly: An Engaging English Quiz on the Versatile American Actor (Born 1965)