Hank was Nora's ex-boyfriend and possibly the secondary antagonist in the first Cheaper by the Dozen film. He is very self-obsessed and is an actor.
The Baker's don't like Hank because of his somewhat snobbish nature. Nora mentions that he was an only child, which could contribute towards the fact he doesn't like the Baker children. He was an actor in a commercial and even admitted the fact he wasn't a very good actor and only got the job because of his face. He doesn't like kids and doesn't want to have any children in the future.
When Nora was asked to babysit her younger siblings she roped Hank into it, but was wary because last time the kids set his pants on fire. Instead, the children soak his underwear in meat and allow Gunner, the family dog, to attack his bottom. Soon all of the dogs in the street attack him as he and Nora go to his car. When Mark goes missing, Nora is disappointed that he didn't want to help looking for Mark and didn't want children. Nora may have broken up with Hank because of those reasons, considering he doesn't appear in the second film.
Hank is portrayed by Ashton Kutcher in the first film. He did not appear in the second.