Question: The Ewing family is the core family of a soap opera that aired on which channel ?

Context paragraphs:
Spaulding family: The Spaulding Family is a fictional family on the CBS daytime soap opera Guiding Light, and currently reside in the fictional town of Springfield.  The Spaulding family became one of the core family on the show follow their arrival in 1977.

Dallas (1978 TV series): Dallas is an American prime time television soap opera that aired on CBS from April 2, 1978, to May 3, 1991.  The series revolves around a wealthy and feuding Texas family, the Ewings, who own the independent oil company Ewing Oil and the cattle-ranching land of Southfork.  The series originally focused on the marriage of Bobby Ewing and Pamela Barnes, whose families were sworn enemies with each other.  As the series progressed, oil tycoon J. R. Ewing became the show's breakout character, whose schemes and dirty business became the show's trademark.  When the show ended in May 1991, J.R. was the only character to have appeared in every episode.

Pam Ewing: Pamela Barnes Ewing is a fictional character from the CBS primetime soap opera, "Dallas".  Pamela is portrayed by actress Victoria Principal, first appearing on the show in the first episode, entitled "Digger's Daughter", which was first broadcast on April 2, 1978.  "Dallas" follows the trials of the wealthy Ewing oil family in the city of Dallas, Texas, which Pam has married into.  Principal played Pam until the end of the tenth season of "Dallas" in 1987, when the character crashes into a truck carrying butane and propane and her body is severely burned.  After this, she is briefly played by actress Margaret Michaels in an attempt to write the character out.  Pamela's storylines in season 1 focus on her relationship with her new husband, Bobby Ewing (Patrick Duffy), and her fight against the considerable suspicion and hostility from within the Ewing family, due to Pamela being a member of the Barnes family.  Pamela's love for Bobby remains a strong character trait throughout her tenure on the show, noted for its similarities to "Romeo and Juliet", with two people from hostile families falling in love.

Buchanan family: The Buchanan family is a long-running family of fictional characters on the American soap opera "One Life to Live".  The ensemble was originally inspired by the Ewing family on the 1970s primetime soap opera "Dallas", and appeared from September 1979 through the end of the serial in August 2013.

Gary Ewing: Garrison "Gary" Arthur Ewing is a fictional character from the CBS soap opera, "Knots Landing", a spin-off of "Dallas".  The character of Gary Ewing was first played by actor David Ackroyd, in a 2-part "Dallas" episode entitled "Reunion", which broadcast in September 1978.  Gary Ewing was the second son of oil baron Jock Ewing and Miss Ellie Ewing, the father of Lucy Ewing and the ex-husband of Valene Ewing.  Over a year later, the part of Gary Ewing was recast for the spin-off "Knots Landing" with actor Ted Shackelford in the role, and Gary became one of the main stars of the series in December 1979.  Ted Shackelford played Gary Ewing in "Knots Landing" for its entire fourteen seasons (1979–1993), while continuing to make occasional appearances in "Dallas" during that time.  The character of Gary made his last "Knots Landing" appearance in 1997, in the reunion series "".  Shackelford reprised his character for the new, updated version of "Dallas" in 2013.

Unter Uns: Unter Uns is a German television soap opera, first broadcast on RTL on 28 November 1994.  Centered on the lives of the people in a residential house, which is set in the fictional Schillerallee in Cologne.  Since the show debuted the baker's family Weigel is the series core family.  "Unter Uns" is not based on a foreign soap opera like "Verbotene Liebe" or "Gute Zeiten, schlechte Zeiten".  After "Gute Zeiten, schlechte Zeiten", the show was the second daily soap for RTL, followed years later in 2006 by "Alles was zählt".  The show aired its 5000th episode on 16 December 2014.

Sue Ellen Ewing: Sue Ellen Ewing (maiden name Shepard) is a fictional character and one of the female leads in the CBS primetime soap opera "Dallas" and its continuation series.  Sue Ellen is portrayed by actress Linda Gray and has appeared on the show since its pilot episode, first broadcast on April 2, 1978.  "Dallas" follows the trials of the wealthy Ewing family in the city of Dallas, Texas, into which Sue Ellen married when she wed the notoriously evil J. R. Ewing.  Gray played Sue Ellen until the twelfth season of "Dallas", when her character finally leaves Texas after beating J.R. at his own game, seen in the episode "Reel Life".  However, Gray later returned for the series finale "Conundrum Part II", the subsequent "Dallas" telemovies ("" and ""), and the reunion special entitled "", which aired in 2004, and reunited her with former castmates.

Barnes family: The Barnes family is one of the main families of the American prime time soap opera "Dallas" and its 2012 sequel.  The feud between the Barnes family and their rival Ewing family forms much of the core plot-line of the series.

Ewing family (television): The Ewing family is the core family of the American prime time soap opera "Dallas" and its 2012 revival, as well as the foundation of the spin-off series "Knots Landing".  In the original series of "Dallas", the Ewings owned and ran Southfork Ranch and the oil giant Ewing Oil; in the revival series, Ewing Oil is replaced by Ewing Global, formerly Ewing Energies.  "Knots Landing" featured the large corporation of Gary Ewing Enterprises.

Miss Ellie Ewing: Eleanor "Miss Ellie" Farlow (maiden name Southworth; formerly Ewing) is a fictional character, from the CBS soap opera "Dallas", a long running serial centered on the lives of the wealthy Ewing family in Dallas, Texas.  Throughout her run, the character remains an important part of the show's structure.  Created by writer David Jacobs, the role was originated by screen actress Barbara Bel Geddes in the series pilot episode until her departure in 1984.  For the 1984–85 season, Bel Geddes was replaced by movie and television actress Donna Reed, who would only play the part for just that one season.  Bel Geddes returned at the start of "Dallas"'s 1985–86 season and remained in the show until near the end of the 1989–90 season, when Bel Geddes wanted to retire from acting.

Supporting paragraphs: Ewing family (television) Dallas (1978 TV series)
Answer: CBS