
Bert is both Jessica’s nephew by marriage and an investigating officer in S1 E8: “We’re Off to Kill the Wizard.”

Bert is both Jessica’s nephew by marriage and an investigating officer in S1 E8: “We’re Off to Kill the Wizard.”

Cindy is Jessica’s grandniece, whom she visits in S1 E8: “We’re Off to Kill the Wizard.”

Billy is Jessica’s grandnephew, whom she visits in S1 E8: “We’re Off to Kill the Wizard.”

Carol is Jessica’s Chicagoland niece, whom she visits in S1 E8: “We’re Off to Kill the Wizard.”
Whether Carol is the daughter of a sibling of Jessica or Frank is not specified; however, her husband Bert refers to Jessica as “your aunt” which at least rules out Bert as Jessica’s nephew. While it would be unusual and awkward of Bert to refer to Jessica as “your uncle’s widow,” I’m going to nevertheless place Carol on Jessica’s side of the Fletcher Family Tree.

Jessica’s cousin Abby is a professional horse trainer. She was a suspect in a 1984 murder in rural Virginia in S1 E5: “It’s a Dog’s Life.” After the trial, she returned to her home in Kent.

Victoria Griffin née Brandon (Genie Francis) is Jessica’s niece. As of S1 E3, she lives in Los Angeles with her husband, Howard Griffin.
Victoria is allergic to flowers.

Howard Griffin, married 1984

Howard Griffin (Jeff Conaway) is Jessica’s nephew by marriage. As of S1 E3, he lives in Los Angeles with his wife, Victoria Griffin née Brandon. Howard is an actor.

Victoria Brandon, married 1984

Grady Fletcher (Michael Horton) is Jessica’s nephew by marriage. As of S1 E1, he lives in New York and is unmarried. Grady is an accountant.

Kitt Donovan, fiancée, 1984