Question: Byron McCandless is the grandfather of this NASA astronaut who made the first ever untethered free flight in what year?

Context paragraphs:
Byron McCandless: Commodore Byron McCandless (September 5, 1881 – May 30, 1967) was a longtime U.S. Navy officer who was awarded the Navy Cross during World War I and the Legion of Merit during World War II.  He was also prominent in the field of vexillology (the study of flags), and helped design two separate versions of the Flag of the President of the United States.  He was the father of Bruce McCandless, also a naval officer, and the grandfather of NASA astronaut Bruce McCandless II.  Commodore McCandless was later promoted to the rank of Rear Admiral on the retired list.

Joseph R. Tanner: Joseph Richard "Joe" Tanner (born January 21, 1950) is an American instructor at the University of Colorado Boulder, mechanical engineer, a former naval officer and aviator, and a former NASA astronaut.  He was born in Danville, Illinois.  He is unusual among astronauts as he did not have a background in flight test nor did he earn any advanced academic degrees.  Typically those who did not do military flight test have an M.D. or Ph.D., if not a master's, whereas Tanner's path to becoming an astronaut followed operational military flying and then into NASA for operational jet training before being selected into the NASA Astronaut Corps in 1992, following an unsuccessful application in 1987.

C. Gordon Fullerton: Charles Gordon Fullerton (October 11, 1936 – August 21, 2013) was a United States Air Force colonel, a USAF and NASA astronaut, and a research pilot at NASA's Dryden Flight Research Facility, Edwards, California.  His assignments included a variety of flight research and support activities piloting NASA's B-52 launch aircraft, the Boeing 747 Shuttle Carrier Aircraft (SCA), and other multi-engine and high performance aircraft.  Fullerton, who logged more than 380 hours in space flight, was a NASA astronaut from September 1969 until November 1986 when he joined the research pilot office at Dryden.  In July 1988, he completed a 30-year career with the U.S. Air Force and retired as a colonel.  He continued in his position of NASA research pilot as a civilian.  Fullerton and his wife and their two children lived in Lancaster, California.

Clifton Williams: Clifton Curtis "C.C." Williams Jr. (September 26, 1932 – October 5, 1967), (Major, USMC), was an American naval aviator, test pilot, mechanical engineer, Major in the United States Marine Corps, and NASA astronaut, who was killed in a plane crash; he had never been to space.  The crash was caused by a mechanical failure in a NASA T-38 jet trainer, which he was piloting to visit his parents in Mobile, Alabama.  The failure caused the flight controls to stop responding, and although he activated the ejection seat, it did not save him.  He was the fourth astronaut from NASA's Astronaut Group 3 to have died, the first two (Bassett and Freeman) having been killed in separate T-38 flights and (Chaffee) in the Apollo 1 fire earlier that year.  The aircraft crashed in Florida near Tallahassee within an hour of departing Patrick AFB.

Alan Bean: Alan LaVern Bean (born March 15, 1932), (CAPT, USN, Ret.) , is an American former naval officer and Naval Aviator, aeronautical engineer, test pilot, and NASA astronaut; he was the fourth person to walk on the Moon.  He was selected to become an astronaut by NASA in 1963 as part of Astronaut Group 3.  He made his first flight into space aboard Apollo 12, the second manned mission to land on the Moon, at the age of thirty-seven years in November 1969.  He made his second and final flight into space on the Skylab 3 mission in 1973, the second manned mission to the Skylab space station.  After retiring from the United States Navy in 1975 and NASA in 1981, he pursued his interest in painting, depicting various space-related scenes and documenting his own experiences in space as well as that of his fellow Apollo program astronauts.

Bruce McCandless II: Bruce McCandless II (born June 8, 1937), (Capt, USN, Ret.) , is an American former naval officer and aviator, electrical engineer, and former NASA astronaut.  During the first of his two Space Shuttle missions he made the first ever untethered free flight using the Manned Maneuvering Unit in 1984.

Bruce McCandless: Bruce McCandless I (August 12, 1911 – January 24, 1968) was an officer of United States Navy who received the Medal of Honor during World War II for his heroism on board the  , during the Naval Battle of Guadalcanal, November 13, 1942.  He retired with the rank of Rear Admiral.  McCandless was the father of NASA astronaut, CAPT Bruce McCandless II, USN (Ret).  Additionally, Admiral McCandless was the great-grandson of David Colbert McCanles of the Rock Creek Station, Nebraska shoot-out with Wild Bill Hickok.  After that, the McCanles family changed its name to McCandless and moved to Florence, Colorado.

Joseph M. Acaba: Joseph Michael "Joe" Acaba (born May 17, 1967) is an educator, hydrogeologist, and NASA astronaut.  In May 2004 he became the first person of Puerto Rican heritage to be named as a NASA astronaut candidate, when he was selected as a member of NASA Astronaut Training Group 19.  He completed his training on February 10, 2006 and was assigned to STS-119, which flew from March 15 to March 28, 2009 to deliver the final set of solar arrays to the International Space Station.  Acaba served as a Flight Engineer aboard the International Space Station, having launched on May 15, 2012.  He arrived at the space station on May 17 and returned to Earth on September 17, 2012 at 6:53am Moscow Standard Time when touchdown was officially recorded by the Russian Federal Space Agency.  Acaba returned to the International Space Station in 2017 as a member of Expedition 53/54.

Jack D. Fischer: Jack David Fischer (born January 23, 1974) is an American engineer, test pilot and a NASA astronaut.  Fischer was selected in June 2009 as a member of the NASA Astronaut Group 20 and qualified as an astronaut in 2011.  He made his first spaceflight in April 2017, as a flight engineer for Expedition 51/52 on the International Space Station.

Michael S. Hopkins: Michael Scott Hopkins (born December 28, 1968) is a Colonel in the U.S. Air Force, and a current NASA astronaut.  Hopkins was selected in June 2009 as a member of the NASA Astronaut Group 20.  He made his first spaceflight as a Flight Engineer on Soyuz TMA-10M/Expedition 37/Expedition 38, from September 2013 until March 2014.  He was the first member of his astronaut class to fly in space.

Supporting paragraphs: Byron McCandless Bruce McCandless II
Answer: 1984