Sylvia Walker is Stanley Walker's mother.
Before her friends have had the chance to meet Sylvia, Karen has made the impression that her mother-in-law is evil and domineering that Karen feels stressed out whenever she visits.
However, when Jack and Will finally meet Sylvia, they are surprised to see a small, quiet lady who is polite and well-mannered. After Karen leaves Sylvia with them, they take her to a gay bar where they find out that although she seems gentle, she is extremely homophobic.
- Karen mentions that she was a USO girl during the 1940s.