Jack's Mom is married to Jack's Dad. It is unknown if she has a job, though she is gone during the day most times, so it can be assumed she is either busy or has a job.
She seems to be calm and happy person most of the time.
Jack's Mom was first shown in the Mystery Kids, and was created in 1996. She has since been in every form of media that involve Jack and Twister including the picture/text comic books and the panel comics.