Question: What was the nickname of grandfather of the man that married the former Carol Shepp in 1965?

full_context: Document 1: Cindy McCain: Cindy Lou Hensley McCain (born May 20, 1954) is an American businesswoman, philanthropist, and humanitarian, and the wife of long-time United States Senator and 2008 Republican presidential nominee John McCain of Arizona.
Document 2: Early life and military career of John McCain: The early life and military career of John Sidney McCain III spans the first forty-five years of his life (1936–1981). McCain's father and grandfather were admirals in the United States Navy. McCain was born on August 29, 1936, in the Panama Canal Zone, and attended many schools growing up as his family moved among naval facilities. McCain graduated from the United States Naval Academy in 1958. He married the former Carol Shepp in 1965; he adopted two children from her previous marriage and they had another child together.
Document 3: Richard R. McNulty: Richard Robert McNulty, Rear admiral United States Navy, Vice admiral USMS, was born in Gloucester, Massachusetts on April 20, 1899 and died in Boston, Massachusetts on November 1, 1980. The United States Merchant Marine Academy community considers Vice Admiral McNulty, a World War II veteran, who had long advocated for the Academy's creation, its "Father". The Academy's McNulty Campus is named for the Vice Admiral. He served as the Academy's 3rd superintendent. Vice Admiral McNulty was, too, a professor emeritus at Georgetown University.
Document 4: Albert O. Vorse Jr.: Albert Ogden "Scoop" Vorse Jr. was an accomplished World War II naval ace who participated in some of the most prominent actions of the Pacific Theater, including the Battle of the Coral Sea and the Guadalcanal Campaign. Vorse served in early fighter squadrons with legendary figures like Butch O'Hare and Jimmy Thach. Rising in rank throughout the war, he would act as Executive Officer and Operations Officer in different squadrons before being given command of his own squadron, VF-80, the eponymous "Vorse's Vipers". Vorse ended the war as commander of Air Group 80 and ultimately achieved Rear Admiral status before his retirement from the U.S. Navy in 1959.
Document 5: Mark McCain: Mark McCain is the son of rancher Lucas McCain in the ABC Western television series "The Rifleman," which ran from 1958 to 1963. Singer/actor and former Mousketeer Johnny Crawford was cast in the role, and was nominated for an Emmy Award in 1959 as Best Supporting Actor (Continuing Character) in a Dramatic Series. The award went to Dennis Weaver, then portraying Chester Goode on CBS's "Gunsmoke".
Document 6: John McCain presidential campaign, 2000: The 2000 presidential campaign of John McCain, the United States Senator from Arizona, began in September 1999. He announced his run for the Republican Party nomination for the presidency of the United States in the 2000 presidential election.
Document 7: John William Finn: John William Finn (23 July 1909 – 27 May 2010) was a sailor in the United States Navy who, as a chief petty officer, received the United States military's highest decoration, the Medal of Honor, for his actions during the attack on Pearl Harbor in World War II. As a chief aviation ordnanceman stationed at Naval Air Station Kaneohe Bay, he earned the medal by manning a machine gun from an exposed position throughout the attack, despite being repeatedly wounded. He continued to serve in the Navy and in 1942 was commissioned an ensign. In 1947 he was reverted to chief petty officer, eventually rising to lieutenant before his 1956 retirement. In his later years he made many appearances at events celebrating veterans. At the time of his death, Finn was the oldest living Medal of Honor recipient, the last living recipient from the attack on Pearl Harbor, and the last United States Navy recipient of World War II.
Document 8: Tom McCarthy (ice hockey, born 1934): He married Marlene Weaver and became the father of two daughters and one son, Carol, Johan, and Martin. Furthermore, he was the grandfather of five grandchildren: two grandsons and three granddaughters, Bryan, Thomas, Erin, Holly, and Kelly.
Document 9: John S. McCain Sr.: John Sidney McCain Sr. (August 9, 1884 – September 6, 1945), nicknamed "Slew", was a U.S. Navy admiral. He held several command assignments during the Pacific campaign of World War II. He is the patriarch of the McCain military family.
Document 10: John Gardner Ford: John "Jack" Gardner Ford (born March 16, 1952) is the second child and second son of U.S. President Gerald Ford and Betty Ford. Married to Juliann Felando Ford on April 29, 1989 and they have two sons, Christian Gerald Ford (born October 14, 1997), and Jonathan August Ford (born November 29, 1999). He is a 1970 graduate of T.C. Williams High School in Alexandria, Virginia. He attended Utah State University, studying Forestry.
Document 11: William Halsey Jr.: William Frederick Halsey Jr., GBE (October 30, 1882August 16, 1959), known as Bill Halsey or "Bull" Halsey, was an American admiral in the United States Navy during World War II. He is one of the four individuals to have attained the rank of Fleet Admiral of the United States Navy.
Document 12: John Paul Jones: John Paul Jones (born John Paul; July 6, 1747 July 18, 1792) was the United States' first well-known naval commander in the American Revolutionary War. He made many friends and enemies—who accused him of piracy—among America's political elites, and his actions in British waters during the Revolution earned him an international reputation which persists to this day. As such, he is sometimes referred to as the "Father of the American Navy" (an epithet that he shares with John Barry and John Adams). He later served in the Imperial Russian Navy, subsequently obtaining the rank of rear admiral.
Document 13: Carol McCain: Carol Shepp McCain (born 1937 or 1938) is a former model, director of the White House Visitors Office, and event planner. She was the first wife of United States Senator and two-time presidential candidate John McCain.
Document 14: David Herold: David E. Herold was born in Maryland, the sixth of 11 children of Adam George Herold (June 6, 1803 – October 6, 1864) and Mary Ann Porter (January 8, 1810 – February 16, 1883). Adam and Mary were married on November 9, 1828 in Washington, DC. David was their only son to survive to adulthood. His father Adam was the Chief Clerk of the Naval Storehouse at the Washington Navy Yard for over 20 years. Herold's family was well-off financially and lived in a large brick house at 636 Eighth Street SE in Washington, D.C., near the Washington Navy Yard. David attended Gonzaga College High School, Georgetown College, Charlotte Hall Military Academy (at Charlotte Hall, St. Mary's County, Maryland), and the Rittenhouse Academy. In 1860 Herold received a certificate in pharmacy from Georgetown College. He then worked as a pharmacist's assistant and as a clerk for a doctor, and was an avid hunter. He became acquainted with John Surratt while attending classes at Charlotte Hall Military Academy in the late 1850s. A few years later, in December 1864, Surratt introduced him to John Wilkes Booth.
Document 15: Chester W. Nimitz: Chester William Nimitz, Sr. ( ; February 24, 1885February 20, 1966) was a fleet admiral of the United States Navy. He played a major role in the naval history of World War II as Commander in Chief, United States Pacific Fleet (CinCPac) and Commander in Chief, Pacific Ocean Areas (CinCPOA), commanding Allied air, land, and sea forces during World War II.
ground_truth: Slew