 Grammer, who had lost his father as a child, and the childless Mahoney immediately built a close father-son relationship.In discussing Martin's nurse, Warren Littlefield of NBC suggested she be English instead of Hispanic and suggested Leeves for the role.Grammer was initially reluctant, as he thought the casting made the show resemble "Nanny and the Professor", but approved Leeves after a meeting and read-through with her.