|First Appearance:||My Grandson, the Warlock|
|Last Appearance:||Mixed Doubles|
|Portrayer:||Mitchell Silberman (Season 7)|
|Family:||Louise Tate (mother) |
Larry Tate (father)
|Relatives:||Aunt Harriet (great-aunt)|
|Residence:||New York City metropolitan area|
Louise discovers she is pregnant (and informs Larry) in episode 12 of Season 1 entitled "...And Something Makes Three". There is no mention of Louise's pregnancy, Jonathan's birth, or Jonathan at all for some time after the announcement.
Jonathan's first appearance is in episode 4 of Season 2 entitled "My Grandson, The Warlock." Jonathan features heavily in this episode as Samantha's father Maurice mistakes Jonathan as the child of Samantha and Darrin and takes the child to show him off at the London Warlocks' Club.