When he took over, the first thing he said was he didn't want to be like his dad. Irsay fought his demons, but what he wasn't was Bob Irsay for sure. He appreciated the fans and his philanthropy was non-stop.
He's been grooming one of his daughters to take over for several years. You could find her regularly on the sidelines wearing headphones. She has been running much of the non-football operations like marketing and tickets. Not sure the involvement of the other two.
Edit: From ESPN
Moving forward, ownership of the Colts is expected to be transferred to Irsay's daughters. Each was given an ownership title in 2012 and has had active roles in the organization for years. How much of the team, if any, was transferred to the daughters remains unclear, as well as the impact of potential estate taxes.
Fun story. Before moving to Florida, my son played in a cover band called DUDE!. Irsay hired them to play Super Bowl week and before games in Lucas Oil Stadium. Irsay wanted them to play at some special event. The girl who sang didn't have a car and couldn't make the practices Irsay scheduled. What's Irsay do? Pay for an Uber? Nope, he bought her a car. Told her to pick one out. She tells him she found a nice used car. He tells her he will take care of it. She goes to pick it up and there is a new fully loaded Escalade waiting for her.
RIP Jimmy.