They are both reliant on the talents of the Rooney and Mara dynasties.
The Pittsburgh Steelers are majority-owned by the Rooney family. The late Art Rooney (“the Chief”) ran the club for many years, ultimately giving way to son Dan, who has since given way to son Art Rooney II.
The New York Giants are 50 percent owned by John Mara. The late Tim Mara ran the club for many years, ultimately giving way to his son (and John’s father) Wellington; there have been a variety of other Maras involved in the team.