Bewitched - Season 2 - Eps 4: My Grandson the Warlock
The Stephens look after the Tate's baby while they are in London. When they return from the Tate's house with Jonathan, their baby, nosy old Gladys Kravitz finds Maurice and tells him that the baby has been born. Maurice then takes Jonathan, who he believes is his grandson, to a Warlock Club in London to teach him about witchcraft. After series of misunderstandings, Samantha clears everything up when she tells Maurice and Gladys that her baby is not due for a few months.
About Bewitched

Title: Bewitched
First Air Date: 1964-09-17
Last Air Date: 1972-03-25
Status: Ended
Rating: 7.861/10 (from 695 votes)
Language: EN
Seasons: 8
Total Episodes: 254
Network: ABC
Genres: Sci-Fi & Fantasy, Comedy, Family, Drama
Production Companies: Columbia Pictures Television, Screen Gems
Synopsis
Samantha Stephens is a seemingly normal suburban housewife who also happens to be a genuine witch, with all the requisite magical powers. Her husband Darrin insists that Samantha keep her witchcraft under wraps, but situations invariably require her to indulge her powers while keeping her bothersome mother Endora at bay.
Cast

Elizabeth Montgomery
Samantha Stephens

Dick Sargent
Darrin Stephens

Agnes Moorehead
Endora

David White
Larry Tate