Question: Boston Custer was the youngest brother of which two-time Medal of Honor recipient?

full_context: Document 1: Thomas Custer: Thomas Ward Custer (March 15, 1845 – June 25, 1876) was a United States Army officer and two-time recipient of the Medal of Honor for bravery during the American Civil War. He was a younger brother of George Armstrong Custer's, and perished with him and their younger brother, Boston Custer, at Little Bighorn in the Montana Territory.
Document 2: Terrence Begley: Sergeant Terrence Begley (died 25 August 1864) was an Irish soldier who fought in the American Civil War. Begley was awarded the United States' highest award for bravery during combat, the Medal of Honor, for his action during the Battle of Cold Harbor in Cold Harbor, Virginia on 3 June 1864. He was honored posthumously with the award on 1 December 1864.
Document 3: Louis McLane Hamilton: Louis McLane Hamilton (1844–1868) was an officer in the United States Army during and after the American Civil War. He served as a captain under General George Armstrong Custer in the Indian Territory in present-day Oklahoma, where he died at the age of 24 while leading a charge in the Battle of Washita River. He was a grandson of Alexander Hamilton, one of the Founding Fathers of the United States.
Document 4: Boston Custer: Boston Custer (October 31, 1848 – June 25, 1876) was the youngest brother of U.S. Army Lt Colonel George Armstrong Custer and two-time Medal of Honor recipient Captain Thomas Custer. He was killed at the Battle of the Little Bighorn along with his two brothers.
Document 5: Cole Younger: Thomas Coleman "Cole" Younger (January 15, 1844 – March 21, 1916) was an American Confederate guerrilla during the American Civil War and later an outlaw leader with the James–Younger Gang. He was the eldest brother of Jim, John and Bob Younger, who were also members of the gang.
Document 6: Moving Robe Woman: Moving Robe Woman (Sioux name Tȟašína Máni), also known as Mary Crawler, Her Eagle Robe, She Walks With Her Shawl, and Walking Blanket Woman, was a Hunkpapa Sioux woman who fought against Custer during the Battle of Little Big Horn to avenge her brother, One Hawk, who had been killed. Her father's name was Crawler, and he was also present at the battle. An Oglala Lakota warrior named Fast Eagle claimed that he had held Custer's arms while Moving Robe Woman stabbed him in the back, but several other warriors claimed to have killed Custer, so it is uncertain if she actually killed him, especially since there are no published post-mortem accounts that describe Custer as having stab wounds, and because officers who found his body described him as having died of gunshot wounds.
Document 7: Battle of Appomattox Station: The Battle of Appomattox Station was fought between a Union Army (Army of the Potomac, Army of the James, Army of the Shenandoah) cavalry division under the command of Brigadier General (Brevet Major General) George Armstrong Custer and Confederate Army of Northern Virginia artillery units commanded by Brigadier General Lindsay Walker with support from some dismounted cavalrymen, artillerymen armed with muskets and some stragglers on April 8, 1865, at Appomattox Station, Virginia during the Appomattox Campaign of the American Civil War.
Document 8: Henry Armstrong Reed: Henry Armstrong Reed (April 27, 1858 – June 25, 1876) was the nephew of George Armstrong Custer, Thomas Custer, and Boston Custer. Although not an official soldier, he was killed along with them at the Battle of the Little Bighorn at the age of 18.
Document 9: Henry Goddard Thomas: Brigadier General and Brevet Major General Henry Goddard Thomas (April 5, 1837 – January 23, 1897) was a Union general in the American Civil War. A native of Portland, Maine, Thomas graduated from Amherst College in 1858 and was admitted to the bar shortly thereafter. He enlisted as a private in the 5th Maine Volunteer Infantry Regiment. Promoted to captain in June 1861, Thomas was present at the First Battle of Bull Run and the Peninsula Campaign among other battles. In February 1863, Thomas was appointed colonel of the 2nd United States Colored Infantry. In December 1863, Thomas was appointed colonel of the 19th United States Colored Infantry. On November 30, 1864, President Abraham Lincoln appointed Thomas a brigadier general of volunteers to rank from his appointment date. The President nominated Thomas for the appointment on December 12, 1864 and the U.S. Senate confirmed the promotion on February 23, 1865. Thomas was mustered out of the volunteers on January 15, 1866. On March 29, 1867, President Andrew Johnson nominated Thomas for appointment to the grade of brevet major general of volunteers for his service during the war, to rank from March 13, 1865, and the U.S. Senate confirmed the award on April 5, 1867. Henry Goddard Thomas died in January 23, 1897 in Oklahoma City Indian Territory (Oklahoma) and is interred at Evergreen Cemetery in Portland, Maine.
Document 10: Little Hawk (Crazy Horse's brother): Little Hawk (1842-1871) is the younger half brother of the famous Oglala warrior Crazy Horse # 3 (1840- 1877). He was the offspring of the remarriage of Worm, Crazy Horse's # 2 widowed father, to a pair of sisters of the Brulé Lakota chief Spotted Tail, Iron Between Horns and Kills Enemy.
Document 11: George Armstrong Custer: Custer developed a strong reputation during the Civil War. He participated in the first major engagement, the First Battle of Bull Run on July 21, 1861, near Washington, D.C. His association with several important officers helped his career as did his success as a highly effective cavalry commander. Custer was brevetted to brigadier general at age 23, less than a week before the Battle of Gettysburg, where he personally led cavalry charges that prevented Confederate cavalry from attacking the Union rear in support of Pickett's Charge. He was wounded in the Battle of Culpeper Court House in Virginia on September 13, 1863. In 1864, Custer was awarded another star and brevetted to major general rank. At the conclusion of the Appomattox Campaign, in which he and his troops played a decisive role, Custer was present at General Robert E. Lee's surrender to General Ulysses S. Grant, on April 9, 1865.
Document 12: Buffalo Calf Road Woman: Buffalo Calf Road Woman, or Brave Woman (c. 1850s? – 1879), was a Northern Cheyenne woman who saved her wounded warrior brother, Chief Comes in Sight, in the Battle of the Rosebud (as it was named by the United States) in 1876. Her rescue helped rally the Cheyenne warriors to win the battle. She fought next to her husband in the Battle of the Little Bighorn that same year. In 2005 Northern Cheyenne storytellers broke more than 100 years of silence about the battle, and they credited Buffalo Calf Road Woman with striking the blow that knocked Lieutenant Colonel George Armstrong Custer off his horse before he died.
Document 13: Edward R. Hanford: Edward R. Hanford (1845–1890) was a private in the 2nd U.S. Cavalry, Company H, during the American Civil War. Born in Allegany County, New York, in 1845, Hanford captured the battle flag of the 32nd Battalion Virginia Cavalry of the Confederate States of America at the Battle of Tom's Brook, Woodstock, Virginia, on 9 October 1864. The Union charge, led by generals Wesley Merritt and George Armstrong Custer, successfully forced the Confederates to retreat 10 mi southward of Woodstock. Hanford received the Medal of Honor on 14 October 1864 for capturing the Confederate battle flag during the charge and for demonstrating "extraordinary heroism". Hanford died in California in 1890 and was buried in the Mokelumne Hill Protestant Cemetery of Mokelumne Hill, Calaveras County.
Document 14: Battle of Washita River: The Battle of Washita River (also called Battle of the Washita or the Washita Massacre) occurred on November 27, 1868 when Lt. Col. George Armstrong Custer’s 7th U.S. Cavalry attacked Black Kettle’s Southern Cheyenne camp on the Washita River (near present-day Cheyenne, Oklahoma), part of a major winter encampment of numerous Native American tribal bands.
Document 15: Custer Monument (West Point): Custer Monument is a monument at the United States Military Academy Cemetery, in honor of Lieutenant Colonel George Armstrong Custer who was killed along with his immediate command at the Battle of the Little Bighorn on 25 June 1876. Congress approved of a statue, to be made from 20 condemned bronze canons, and for $10,000, of which $6,000 had been subscribed by citizens of New York. The monument was originally located near the academy's headquarters building near the site of present day Taylor Hall along Thayer Road. Unveiled in 1879, the pedestal had a bronze statue of Custer wielding a saber and a pistol. Custer's widow and many officers did not approve of this likeness and after only five years, the statue was removed and sent to New York City where Stanford White was supposed to remove the bust, to be displayed in the library. However after White's murder, its whereabouts have since been lost. The pedestal was moved to Custer's grave site in the West Point Cemetery during the construction of Taylor Hall around 1910. In 1965, a stone obelisk was placed atop the pedestal.
ground_truth: Thomas Ward Custer