Kaitlin Olson reacted to her husband, Rob McElhenney, changing his name to Rob Mac during an interview with PEOPLE at the 'It's Always Sunny in Philadelphia' 20th Anniversary Celebration on July 1.

Kaitlin Olson and Rob McElhenney's two children are "not happy" with their dad after he legally changed his name. The It's Always Sunny in Philadelphia star, 48, confirmed on June 27 that he ...