Tom Ricketts is the controlling owner of the Chicago Cubs. He and his three siblings make up four of the five members of the Cubs’ current board of directors. They hold 95% of the Cubs franchise through a trust formed by their parents.
For the Ricketts, its a family-run business, not too unlike some of the Major League franchises from the past. The Wrigley, Comiskey, and O’Malley families were examples of owners of big league clubs, before the day when major corporations began owning and operating the clubs.
My book, Family Ties: A Comprehensive Collection of Facts and Trivia About Baseball’s Relatives, has a chapter devoted to family relationships involved in baseball’s administration and ownership of Major League clubs.
See below link from the Chicago Tribune about the Ricketts family: