When you’re an NFL head coach, you’re in charge of a lot of things.

Brian Callahan, the first-year head coach of the Tennessee Titans, is now overseeing aspects he didn’t have to think about before as an assistant. He’s managing practice schedules, strength training and his staff — which happens to include his father, Bill Callahan, as offensive line coach. 

“It’s a dream come true,” Bill told NBC News. “We’re proud of Brian, as we are of all of our children, but this is…