I got a question for you: The Real McCoys revolves around the lives of a family from the Appalachian Mountains who originally hailed from fictional Smokey Corners, West Virginia. The McCoys moved to California to live and work on a farm they inherited from a relative. The family consists of Grandpa Amos McCoy (Walter Brennan); his grandson Luke (Richard Crenna), Luke's new wife Kate (Kathleen Nolan), Luke's teenage sister Tallahassie "Hassie" (Lydia Reed), and his 11-year-old brother "Little Luke" (Michael Winkelman). The double-naming of the brothers is explained in the first full episode, when the elder Luke introduces Little Luke to Pepino Garcia (Tony Martinez) and says, "Well, you see, in the excitement of having him, Ma and Pa' plum' forgot they already had me." Only Crenna appeared in all 225 episodes.

Based on this passage, who played the wife on the real mccoys?
Let's think first:
To answer the question, consider the following: The family consists of Grandpa Amos McCoy (Walter Brennan); his grandson Luke (Richard Crenna), Luke's new wife Kate (Kathleen Nolan), Luke's teenage sister Tallahassie "Hassie" (Lydia Reed), and his 11-year-old brother "Little Luke" (Michael Winkelman).
Therefore, the answer is Kathleen Nolan.