Darrin is worried about his parents' impending visit, the first since Tabitha started using witchcraft. It is even worse timing as Samantha and Darrin find out Tabitha is at a stage called "wishcraft" where anyone she wishes to be near her will automatically appear; more often than not it's Daddy. Samantha calls in her mother for support in dealing with Tabitha. Darrin is wary of having Endora in the house with his parents, and SamaFor support in dealing with Tabitha, Samantha calls in a reinforcement in the form of her mother. Having Endora in the house with his parents doesn't sit well with Darrin. As such, Samantha and Darrin get into an argument about the issue, which in turn raises Endora's back not only regarding Darrin, but Darrin's mother. In this in-law feud, it's Mrs. Stephens Sr. that may need more convincing than anyone that everything is AOK between Darrin and Samantha than what the two can say or do in front of her.
—Huggo