Usually when I want to make a theory of "relateeveety" between two otherwise unrelated TV characters played by the same actor, I have to rely on the old stand-bys: half-brothers, twin sons of different mothers, identical cousins.
But now I have two characters who can be said were identical twins of the same two parents, to be found in two different sitcoms that had no connection to each other.
'THE NANNY' - "ODE TO BARBRA JOAN"
Stewart was the father of C.C. Babcock. And even though he came to NYC to visit with his daughter, Stewart was more interested in going out on a date with Fran Fine.
'Doctor, Doctor' - "Member Of The Club"
Stewart's twin brother Hoey (perhaps short for Howard? Hobart? SO close to Hobie!) was a member of a very toney - and VERY snobbish country club in Rhode Island who invited Dr. Grant Linowitz to join... only to give him the cold shoulder when he tried to bring Dr. Abe Butterfield along.
Abe was black, [He's dead now, unfortunately.] And yet... Grant is Jewish.....
It's pretty hard to find any material online for 'Doctor, Doctor'. So this picture of Robert Culp as Warren on 'Everybody Loves Raymond' will have to be a substitute for Hoey Babcock. I thought the background had an appropriate country club feel to it....