Her parents are Harlow and Edna Swank, and her sister is Sally Chesterson. This is how they are connected to the Roth Family from The Sims 2: Seasons. In the alternate Roth family, Stella, who is Bella's counterpart, is the counterpart of Jocasta because she is Stella's mom, but I was thinking maybe that Jocasta is the sister of Sally and the daughter od Harlow and Edna. This is just my own personal theory, so please don't be hater and write rude things in the comments, not that I think anyone would. ;)
In The Sims 3, Jocasta Bachelor is an adult living with her husband, Simis, teenage son, Michael, and younger daughter, Bella in Sunset Valley. She works as a Book Store Clerk. Jocasta's main priority is keeping her family happy, but her other hobbies include gardening, fishing, and sometimes cooking, though she doesn't have a lot of time to enjoy them. Her lifetime wish is to have the Perfect Garden.
Jocasta's personality traits in The Sims 3 are Over-Emotional, Loner, Green Thumb, Coward, and Angler. The "Loner" trait seems to be chosen incorrectly because Jocasta's aspiration is Popularity and she is even Outgoing in The Sims 2. However, it is possible that Jocasta outgrew the "Loner" trait and became more of an outgoing and popular person. Other traits are completely unique. She grows her own garden in the backyard, which is the biggest garden in Sunset Valley.
When compared to her appearance in The Sims 2, Jocasta's appearance in The Sims 3 is more that of a "housewife and mother" kind of woman. She appears to be slimmer and more elegant in The Sims 2, compared to her appearance in The Sims 3. She wears an orange tank top with yellow capris. Perhaps when her children moved out, she exercised and dressed different.