When the story begins, Caroline (Cloris Leachman) is getting romantic with a man who happens to already be married...as you learn when his wife comes crashing through the door. And, it seems her brother, Collin (George Nader), found out about the man and he informed the wife of the affair. Later, when Collin is getting serious about a woman, Caroline decides to ruin his relationship in what's clearly a case of tit for tat...and keep him dependent upon her. And the weird thing is that there seems to be some VERY creepy relationship between the two siblings...and strong overtones of incest.
I am a bit surprised at this episode. After all, networks didn't take kindly to plots about incest back in the day. While this angle isn't overt, it seems to be strongly implied...and the producers managed to get it on the air anyway! Weird and creepy...that's for sure...and with an interesting twist.
By the way, George Nader's career in Hollywood was cut short when scandal magazines began to circulate stories that he was gay. It turns out he was and soon found himself acting in European films (in several nice James Bond style films) because he couldn't get work at home.