I don't remember which scene it happens, but I know that Sarah calls him John at least once, if not more.
I have the complete script of the current CoP show.
Here are the characters-
Father: John
Mother: Sarah
Son: Jimmy
Daughter: Patricia
Grandma
Grandpa
Cousin Orville
Dog: Rover
In the second vignette (July 4th 1920-something)
FATHER: "There goes Schwartz in his Hupmobile. He sure loves that horn!
You know, in my new Essex, I've got an electric starter! Now I don't have to crank."
Also, another character's voice is heard (but not seen) after the blackout due to a blown fuse.
WOMAN OUTSIDE OF WINDOW: Henry! He did it again! Go over and give that neighbor of ours what for!
Also, at the end of this vignette, John calls his wife "Martha"
(because she is dressing as Martha Washington for the July 4th town celebration.)
In the third vignette (Fall 1940-something)
Another character's voice is heard (but not seen)
"Babs" is the voice on the phone with daughter Patricia.
The high school gals are discussing two guys, Wilfred and Howard.
In the last vignette we get a reprise of Cousin Orville's "No privacy a'tall around this place!"
(And, the oven talks, of course.)