For many of his fans, Kelsey Grammer is inseparable from his character Dr. Frasier Crane, who first appeared on “Cheers” and later got his own spin-off, “Frasier.” Last year, the actor reprised the role in a reboot of “Frasier” that’s now in its second season. But Kelsey’s connection to his most famous character runs deeper than simple nostalgia. He opens up about how the cast of “Frasier” became his family after he suffered several personal tragedies, why he didn’t always feel welcomed on “Cheers,” and how he ended up voicing Sideshow Bob on “The Simpsons.”