When Thirsty Thurston, the Flagstons next-door-neighbor, was first introduced in 1961, his spouse was not identified.  Thirsty served mainly as a golfing buddy for Hi.

In this strip from 1962, Lois refers to “Carrie,” who is not shown, while Thirsty is feeding their newborn baby.  The Thurston’s child and Carrie were never mentioned again.