I remember the Smothers Brothers version quite well:

My old man's a sailor, now waddaya think about that?
He wears a sailor's collar, he wears a sailor's hat
He wears a sailor's raincoat, he wears a sailor's shoes,
And every Saturday evening
He reads the Sunday news.
And some day, if I can,
I'M gonna be a sailr, the same as my old man.

Tossing in, of course, other occupations for "sailor. I've always liked Dick Smothers singing the first line with the "chicken plucker" occupation and Tom saying, "You'd better not make a mistake!"

Try singing it with the occupation

My old man works at the World's Fair: he's in the Provision Division of the Brazilian Pavilion.

I think that this occupation was in "Broadside" or "Sing Out" back in the '60s.

The Irish Rovers also recorded MOMaD.