'Jeff and his family are new to the neighborhood. Can you help Jeff provide for his family and fulfill his lifelong goal of being the first man to walk on Mars?'
Jeff is the middle-aged, kind, father of two. He is mostly bald and what hair he does have is a mixture of black and gray. He wears a dark blue tie over a white shirt with dark, blue pants. Jeff works as a Recruit in the Military career track and wants to be promoted to Astronaut so he can live out his dream to be the first man to walk on Mars.
Life leading up to The Sims 2
By the time the storyline has caught up to The Sims 2, he and his wife Diane are already deceased. His son, Daniel, married Mary-Sue Pleasant and had two children, Angela and Lilith Pleasant. His daughter, Jennifer, married John Burb, and had one child, Lucy Burb. He can be seen in Daniel's, Angela's, Lilith's, Jennifer's, and Lucy's family trees. Both Jeff and Diane died around the time Angela and Lilith were toddlers and Jennifer was pregnant.
Though his character data was deleted, regenerating him with SimPE is slightly easier than most dead ancestors, as his facial features are an exact match to one of the pre-made faces, unlike those of most "unresurrectable" Sims.
Resurrection tip
This Sim has no character data and cannot be resurrected in-game. For more information, read this guide.
There is a chance card in The Sims that gives Sims a chance to go to Mars. It is only available for Astronauts in the Military career track. It is possible that Jeff passed away before he was promoted into one.
When The Sims was released, Maxis was developing a game called SimMars. It's possible, though speculative, that both Jeff's dream of going to Mars and the chance card for the Astronaut career were related to that. Likewise, it's possible, though again speculative, that Jeff dying without getting to Mars was a nod to the fact that SimMars was never released.