Jordan Jacobs
In some universes where Jenny Everywhere grew up as the adopted sister of Julie Jacobs, they had a younger sister called Jordan Jacobs.
In such universes, Jordan and Julie typically knew about Jenny's powers while they were kept a secret from the Jacobs parents. (COMIC: The Mind of Jenny Everywhere)
In one such universe, she was indeed the youngest sister of Jenny Jacobs, the local incarnation of Jenny Everywhere (and of her older sister Julie Jacobs). Jordan was a toddler, much younger than her two big sisters, at the time of Jenny Nowhere's arrival in Westbrook. (COMIC: The Jenny Everywhere Chronicles)
A different Jordan was abducted by an interdimensional enemy of Jenny's. Jenny Everywhere and Julie departed on an interdimensional search for her, but still had not found her three years later, though Julie remained determined. (GAME: The Jenny Everywhere Roleplaying Game)
