The character of Joey Deluca (Nancy Blansky's nephew) is Carmine Ragusa's lookalike cousin. Nancy is also the cousin of Howard Cunningham, which means Howard and Carmine are related.
Following her success as a secondary character in two simultaneous hit series (McMillan & Wife and Rhoda) this was the second 1970s sitcom giving Nancy Walker top billing for which only 13 episodes were produced before it was cancelled. The other one was the eponymous 1976 Nancy Walker Show.