Walt is the sole brother of Martin Crane, and uncle of Niles Crane and Frasier Crane. He is seen (and basically referred to) in only one episode, Beware of Greeks. He is married to Zora Crane, a Greek woman, and is the father of Nikos Crane. He does not communicate with his brother because his wife's disdain for Martin's son, Frasier. However, he likes seeing Martin and the two get along well.
- In an earlier episode, Author, Author, Martin says that he "never had a brother" in a story told to Niles and Frasier, presumably a mistake by the writers.