Although Marge is her most famous character, Kavner's favorite characters to voice are Marge's sisters Patty and Selma Bouvier because "they're really funny and sad at the same time". Series creator Matt Groening instructed Kavner to voice the duo as characters who "suck the life out of everything". Both have similar raspy voices, but Patty's voice is more masculine and has a lower register, while Selma's voice is a little sweeter. Kavner also provides the voices of every other female member of the Bouvier family, including Marge's mother Jacqueline, Great-Aunt Gladys (a dead relative who was introduced on season four's "Selma's Choice"), and an unnamed grandmother seen on the season six episode "Fear of Flying".