Saul is Nora Walker's older brother, and works at Ojai Foods, the Walker family business. He is in his early 60s, but has never been married.
Saul and Nora are very close. He helped her when her husband died, and defended her from their mother's criticism at her birthday party.
Saul had a brief relationship with Holly Harper, William's former mistress, following William's death. Although this briefly caused friction between Saul and Nora, Saul's feelings toward Holly were in fact ambiguous — it was never fully clear whether his intentions were romantic, platonic or business-related.
Throughout season one, Saul was the least developed of the major characters, with very little revealed about his life outside of his roles as brother or uncle to the Walkers.
In the season finale, however, it was revealed that Saul once spent a romantic weekend in Key West with another man, an old friend named Milo who reappears at Kitty and Robert's engagement party after an absence of twenty years. He tells Saul that he has finally come out as gay. The exact nature of Saul's sexuality remained ambiguous, though the storyline was developed further in season two.
In episode '36 hours', Saul acknowledged to his sister Nora that many years ago he was in love with a man.
Saul has often expressed regret for not starting a family of his own and that he is now too old to do so.
Another important clue concerning Saul's orientation turned up in the episode of Kitty & Robert's wedding. At the wedding reception, Holly and Saul have a conversation at the bar about their past times of intimacy. Holly remarks about how Saul keeps lamenting that he always wanted a family of his own, and how she wishes it had happened for him. Saul suggests that maybe their past relationship could have developed further, but Holly says that she could tell that Saul just wasn't that into her, and that while he may have gone through the motions, he obviously was never "feeling it" saying it in a way that someone listening might pass this off as Saul just plainly not being attracted to her. Holly proceeds to tell him, "I know men", and that she knew he was not interested in her. Touchingly, she tells him that everyone should be able to be with who they love, carefully avoiding the use of either masculine or feminine pronouns.
In episode 2.15, Saul finally comes out to his nephew, Kevin, after getting arrested for driving under the influence of alcohol. He tells Kevin that he has missed his entire life and he wants to be happy as a gay man, like Kevin.