Son of Gloria Harker of California.
He has a tight bond with his mother's eldest sister Dorothy Zbornak who hopes to help him find a nice girl to join the family. Jim loves and respects his family and remembers to write on birthdays and calls and just shows how much he cares for his loved ones and family. He has dimples which were made by his aunt Dorothy from holding his cheeks in to kiss him and hug him as a baby child.
In the Empty Nest episode "Dumped" he was visiting Dorothy in Miami and briefly dated his aunt's neighbor Barbara Weston. However, he broke up with Barbara after becoming scared by how well things were going.