Question: When was Ann Walton Kroenke's only sister born?

full_context: Document 1: Walmart: Wal-Mart Stores, Inc. ( ), doing business as Walmart, is an American multinational retailing corporation that operates as a chain of hypermarkets, discount department stores, and grocery stores. Headquartered in Bentonville, Arkansas, the company was founded by Sam Walton in 1962 and incorporated on October 31, 1969. s of 31, 2017 , Walmart has 11,695 stores and clubs in 28countries, under a total of 63banners. The company operates under the name Walmart in the United States and Canada. It operates as Walmart de México y Centroamérica in Mexico and Central America, as Asda in the United Kingdom, as the Seiyu Group in Japan, and as Best Price in India. It has wholly owned operations in Argentina, Chile, Brazil, and Canada. It also owns and operates the Sam's Club retail warehouses.
Document 2: Alice Walton: Alice Louise Walton (born October 7, 1949) is an American heiress to the fortune of Wal-Mart Stores, Inc. She is the daughter of Wal-Mart founder Sam Walton and Helen Walton, and sister of S. Robson Walton, Jim Walton and the late John T. Walton. With a net worth of $40.8 billion she is the wealthiest woman in the world, according to "Forbes", following the death of Liliane Bettencourt in September 2017.
Document 3: Sam Walton: Samuel Moore Walton (March 29, 1918 – April 5, 1992) was an American businessman and entrepreneur best known for founding the retailers Walmart and Sam's Club.
Document 4: Joan Kroc: Joan Beverly Kroc (née Mansfield, previously Smith; August 27, 1928 – October 12, 2003), also known as Joni, was the third wife of McDonald's CEO Ray Kroc. She was also known for her involvement in the McDonald's organization and for her philanthropy.
Document 5: Whitney Williams: Whitney Williams is an American businesswoman and philanthropist, currently serving as Vice-Chair of the board for Eastern Congo Initiative and Founder + CEO of the Seattle-based consultancy williamsworks. She is the daughter of former Congressman Pat Williams and former Montana Senate Majority Leader Carol Williams. "The Washington Post" has referred to the Williams family as the “first family of Montana politics.” Her brother is artist Griff Williams.
Document 6: Clark Hunt: Clark Knobel Hunt (born February 19, 1965) is Chairman, CEO, and part owner of the National Football League's Kansas City Chiefs and a founding investor-owner in Major League Soccer. Hunt also serves as chairman of Hunt Sports Group, where he oversees the operations of FC Dallas and, formerly, the Columbus Crew of MLS. He is the son of Lamar Hunt and the grandson of oil tycoon H.L. Hunt. Following the death of his father Lamar Hunt in 2006, Hunt co-inherited ownership of the Kansas City Chiefs. Clark serves as the ultimate authority as Chairman and CEO.
Document 7: Sam's Club: Sam's West, Inc. (doing business as Sam's Club) is an American chain of membership-only retail warehouse clubs owned and operated by Walmart, founded in 1983 and named after Walmart founder Sam Walton. s of 2012 , Sam's Club chain serves 47 million U.S. (including Puerto Rico) members and is the 8th largest U.S. retailer. s of 31, 2008 , Sam's Club ranks second in sales volume among warehouse clubs with $56.828 billion in sales (in fiscal year 2016) behind Costco.
Document 8: Jane McKechnie Walton: Jane McKechnie Walton was born on July 16, 1847 in Edinburgh, Scotland. She was the daughter of Jane (Jean Tinto) Bee and John McKechnie. Her father was a bell molder by trade and died of typhoid on January 3, 1848 when Jane was just eighteen months old. Her grieving mother gave birth to the McKechnie's only son a few months later. Within another year, Jane's mother was taught about The Church of Jesus Christ of Latter-day Saints (LDS Church) by two Mormon missionaries. She believed their words and was baptized into the LDS Church on February 21, 1850. Several months later, Jane's grandmother, uncle and aunt followed her mother, Jean's footsteps and also joined the newfound religion. By September 1850, Jane's mother, grandmother, uncle, aunt and her own brother and sister were booked for ocean travel on The North Atlantic ship which was bound for New Orleans in America.
Document 9: Waggoner Ranch: The Waggoner Ranch is an historic north Texas ranch located 13 miles south of Vernon, Texas. The land was used primarily to raise crops, beef cattle and horses as well as for oil production. It was notable for being the largest ranch under one fence in the United States. It was originally established in 1852 near Vernon, Texas by Daniel Waggoner under the name of Dan Waggoner & Son; his son being William Thomas Waggoner. It was acquired by Stan Kroenke, who is married to Ann Walton (niece of Sam Walton), in February 2016. At the time of acquisition, the ranch comprised 520,527 acres , or 800 mi2 but additional acreage was included in the sale making the total closer to 535,000 acres .
Document 10: National Charity League: The National Charity League Inc. is a charitable non-profit organization that has mother and daughter members in Chapters in the United States. It was established in Los Angeles, California, in 1925 and was incorporated in 1958. It is a philanthropic organization who deals mainly with community service, social development and cultural experience. His story began in the year 1925 when a small group of women founded the organization in Los Angeles, California. They supported the American Red Cross. The women had their daughters support, and by 1938, the daughters formed their own group. In 1947, both groups united to become a philanthropic organization, and started calling themselves the National Charity League. NCL expanded its program beyond the philanthropic work to include leadership and cultural experience. In 1958, the National Charity League was reorganized and was incorporated and renamed National Charity League, Incorporated.
Document 11: Whitney Ann Kroenke: Whitney Ann Kroenke (born September 29, 1977) is an American heiress, film producer and philanthropist.
Document 12: Stan Kroenke: Enos Stanley Kroenke ( ; born July 29, 1947) is an American business entrepreneur. He is the owner of Kroenke Sports & Entertainment, Denver Nuggets of the NBA, Colorado Avalanche of the NHL, Colorado Rapids of Major League Soccer, Colorado Mammoth of the National Lacrosse League and the Los Angeles Rams of the NFL.
Document 13: Nancy Walton Laurie: Nancy Walton Laurie (born May 15, 1951) is an American heiress to the Walmart fortune, businesswoman and philanthropist.
Document 14: Nancy Priddy: Nancy Lee Priddy (born January 22, 1941) is an American actress and singer-songwriter. As an actress, she has appeared on many television series, including "Bewitched", "The Waltons", and "Matlock". She is the mother of actress Christina Applegate.
Document 15: Ann Walton Kroenke: Ann Walton Kroenke (born December 18, 1948) is an heiress to the Wal-Mart fortune. Kroenke and her sister, Nancy Walton Laurie, inherited stock from her father, Bud Walton (died 1995), who was brother and an early business partner of Wal-Mart founder Sam Walton.
ground_truth: May 15, 1951