- Sims 4 Jeff is a bit younger than he was in The Sims, and still has a full head of hair.
- Jeff's daughter Jennifer does not have any of Jeff's genetics, but Daniel does since Jeff is a modified clone of him.
- If Jeff has any more kids, their hair might be dark grey, since Jeff only has genetics for dark grey hair.
- Jeff's definitive age is 45, which means he was born sometime in 1970.
- Jeff's height is 6'1/186cm.