"Sleeping on planes two nights a week takes its toll," says Weatherly, who admits to lower back pain. "My kids and my wife are here for two weeks and they were here in September for two weeks, so we're spending a lot of time together. Don't worry about me."
Weatherly also has a 20-year-old son, August, from a previous marriage to actress Amelia Heinle, and they've all gotten an education in how showbiz works from watching their dad's career.
"The kids know and love the work experience," Weatherly tells ET. "Both NCISand Bull have been wonderful places to work, so that's kind of something I have grown used to and am very happy to continue."