Title: Sister, Sister (1987 film)
Content: Eric Stoltz as Matt Rutledge ; Ben Cook as young Matt ; Jennifer Jason Leigh as Lucy Bonnard ; Ashley McMurray as young Lucy ; Judith Ivey as Charlotte Bonnard ; Dennis Lipscomb as Sheriff Cleve Doucet ; Anne Pitoniak as Mrs. Bettlehelm ; Benjamin Mouton as Etienne LeViolette ; Casey Levron as young Etienne ; Natalia Nogulich as Fran Steuben ; Richard Minchenberg as Lenny Steuben ; Bobby Pickett as Roger ; Jason Saucier as Jud Nevins ; Jerry Leggio as Mr. Bonnard ; Fay Cohn as Mrs. Bonnard ; Bill Condon as Priest 
Title: My Sister Eileen (TV series)
Content: Elaine Stritch as Ruth Sherwood ; Shirley Bonne as Eileen Sherwood ; Jack Weston as Chick Adams ; Rose Marie as Bertha ; Raymond Bailey as D. X. Beaumont ; Stubby Kaye as Marty Scott ; Leon Belasco as Mr. Appopoplous ; Agnes Moorehead as Aunt Harriet (2 episodes)  Among the guest stars were John Banner, Bert Convy, Anne Helm, Jo Morrow, Richard Webb, and Dick Wesson.
Title: Sister of the Groom
Content: Alicia Silverstone as Audrey ; Tom Everett Scott as Ethan ; Jake Hoffman as Liam ; Mathilde Ollivier as Clemence ; Charlie Bewley as Isaac ; Noah Silver as Orson ; Abigail Marlowe as Suzette ; Mark Blum as Nat ; Julie Engelbrecht as Bernetta ; Ronald Guttman as Philibert ; Wai Ching Ho as Darling Aquino 
Title: The Sister (TV series)
Content: Russell Tovey as Nathan Redman ; Bertie Carvel as Bob Morrow ; Amrita Acharia as Holly Fox ; Amanda Root as June Fox ; Paul Bazely as Graham Fox ; Simone Ashley as Elise Fox ; Nina Toussaint-White as Jacki Hadley ; Ewan Bailey as DCI Holloway 
Title: Sister (2014 film)
Content: Reid Scott as Billy Presser ; Serinda Swan as Melissa ; Grace Kaufman as Niki Presser ; Illeana Douglas as Aunt Connie ; Alexis Dziena as Ashley Presser ; Barbara Hershey as Susan Presser ; Nadine Velazquez ; John Heard 
Title: Sister Against Sister
Content: Virginia Pearson as Anne / Katherine ; Maud Hall Macy as Mrs. Martin ; Walter Law as Huxley ; Irving Cummings as Dunsmore ; Calla Dillatore as Mrs. Raymond ; William Battista as Peter Raymond ; Archie Battista as Johnny Raymond ; Jane Lee as Alice Reynolds 
Title: ER (TV series)
Content:  The episode "Brothers and Sisters" (first broadcast on April 25, 2002) begins a crossover that concludes on the Third Watch episode "Unleashed" in which Susan enlists the help of Officers Maurice Boscorelli and Faith Yokas to find her sister and niece.
Title: Sisters of Eve
Content: Anita Stewart as Beatrice Franklin ; Betty Blythe as Mrs. Wenham Gardner ; Creighton Hale as Leonard Tavernake ; Harold Nelson as Prof. Franklin ; Francis Ford as Pritchard ; Charles King as Wenam Gardner/Jerry Gardner ; Mae Busch 
Title: Sister Kate (TV series)
Content: Stephanie Beacham as Sister Katherine "Kate" Lambert ; Jason Priestley as Todd Mahaffey ; Erin Reed as April Newberry ; Hannah Cutrona as Frederika "Freddy" Marasco ; Penina Segall as Hilary Logan ; Harley Cross as Eugene Colodren ; Alexaundria Simmons as Violet Johnson ; Joel Robinson as Neville Williams ; Mike Williams as Mr. Beard ; Gordon Jump as Lucas Underwood Robert Guillaume in episode "Neville's Hired Hand" ; Marion Ross in episode "The Nun" ; Dan Hedaya  in episode "Father Christmas" ; Milli Vanilli in episode "Eugene's Feat" ; Sally Struthers in episode "Sweet Sixteen"  Guest Stars
Title: Elaine Stritch
Content:  season, Stritch appeared in the role of writer Ruth Sherwood in the CBS sitcom My Sister Eileen, opposite Shirley Bonne as her younger sister, Eileen Sherwood, an aspiring actress. The sisters, natives of Ohio, live in a brownstone apartment in Greenwich Village. The one-season series aired opposite Hawaiian Eye on ABC and Perry Como's Kraft Music Hall on NBC. In 1975, Stritch starred in the British LWT comedy series Two's Company opposite Donald Sinden. She played Dorothy McNab, an American writer living in London who was known for her lurid and sensationalist thriller novels. Sinden played Robert, her English butler, 

Question: who played peter benton's sister on er?
Answer: Jackie Robbins.