Question: When was  Prince William, Duke of Cambridge father born 

full_context: Document 1: Camilla, Duchess of Cornwall: Camilla, Duchess of Cornwall, ("née" Camilla Rosemary Shand, previously Parker Bowles; born 17 July 1947), is the second wife of Charles, Prince of Wales, the eldest child and heir apparent of Queen Elizabeth II. Instead of using the title of Princess of Wales, she uses the title Duchess of Cornwall, her husband's secondary designation. In Scotland, she is known as the Duchess of Rothesay. In the event of Charles acceding to the throne, Camilla would become a queen consort; however, an official statement issued by Clarence House on the day of her marriage to Charles announced that she would be known as the Princess Consort.
Document 2: Catherine, Duchess of Cambridge: Catherine, Duchess of Cambridge (Catherine Elizabeth "Kate"; "née" Middleton; born 9 January 1982) is the wife of Prince William, Duke of Cambridge. Following his father Charles, Prince of Wales, William is second in line to succeed his grandmother, Queen Elizabeth II, as monarch of the United Kingdom and 15 other Commonwealth realms, making Catherine a likely future queen consort.
Document 3: Prince William of Gloucester: Prince William of Gloucester (William Henry Andrew Frederick; 18 December 1941 – 28 August 1972) was a grandson of King George V of the United Kingdom and cousin of Queen Elizabeth II.
Document 4: Duke of Rothesay: Duke of Rothesay (Scottish Gaelic: "Diùc Baile Bhòid" , Scots: "Duik o Rothesay" ) is a dynastic title of the heir apparent to the British throne, currently Prince Charles. It was a title of the heir apparent to the throne of the Kingdom of Scotland before 1707, of the Kingdom of Great Britain from 1707 to 1801, and now of the United Kingdom of Great Britain and Northern Ireland. It is the title mandated for use by the heir apparent when in Scotland, in preference to the titles "Duke of Cornwall" (which also belongs to the eldest living son of the monarch, when and only when he is also heir apparent, by right) and "Prince of Wales" (traditionally granted to the heir apparent), which are used in the rest of the United Kingdom and overseas. The Duke of Rothesay also holds other Scottish titles, including those of Earl of Carrick, Baron of Renfrew, Lord of the Isles and Prince and Great Steward of Scotland. The title is named after Rothesay on the Isle of Bute, Argyll and Bute, but is not associated with any legal entity or landed property, unlike the Duchy of Cornwall.
Document 5: Diana, Princess of Wales: Diana, Princess of Wales (Diana Frances; "née" Spencer; 1 July 1961 – 31 August 1997), was a member of the British royal family as the first wife of Charles, Prince of Wales, who is the eldest child and heir apparent of Queen Elizabeth II.
Document 6: Prince Harry: Prince Henry of Wales {'1': ", '2': ", '3': ", '4': "} (Henry Charles Albert David; born 15 September 1984), familiarly known as Prince Harry, is the younger son of Charles, Prince of Wales, and Diana, Princess of Wales. At the time of his birth, he was third in line of succession to the British throne, after his father and elder brother, but is currently fifth in line after his father, his elder brother, and his nephew and niece, George and Charlotte.
Document 7: Prince George William of Great Britain: Prince George William of Great Britain (13 November 1717 – 17 February 1718) was an infant member of the British royal family, second son of George II and Caroline of Ansbach who, at the time of his birth, were the Prince and Princess of Wales. He died aged 3 months, 4 days.
Document 8: Prince William, Duke of Gloucester: Prince William, Duke of Gloucester (24 July 1689 – 30 July 1700 ) was the son of Princess Anne, later Queen of England, Ireland and Scotland from 1702, and her husband, Prince George, Duke of Cumberland. He was their only child to survive infancy. Styled Duke of Gloucester, he was viewed by contemporaries as a Protestant champion because his birth seemed to cement the Protestant succession established in the "Glorious Revolution" that had deposed his Catholic grandfather James II the previous year.
Document 9: Prince George of Cambridge: Prince George of Cambridge (George Alexander Louis; born 22 July 2013) is the elder child and only son of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge. He is third in line of succession to the British throne, after his paternal grandfather, and father.
Document 10: Prince Andrew, Duke of York: Prince Andrew, Duke of York, {'1': ", '2': ", '3': ", '4': "} (Andrew Albert Christian Edward, born 19 February 1960), is the second son and third child of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. At the time of his birth, he was second in the line of succession to the British throne; as of 2017 he is sixth in line.
Document 11: Charles, Prince of Wales: Charles, Prince of Wales (Charles Philip Arthur George; born 14 November 1948) is the eldest child and heir apparent of Queen Elizabeth II. Known alternatively in Cornwall as Duke of Cornwall and in Scotland as Duke of Rothesay, he is the longest-serving heir apparent in British history, having held the position since 1952. He is also the oldest person to be next in line to the throne since Sophia of Hanover (the heir presumptive to Queen Anne), who died in 1714 at the age of 83.
Document 12: Wedding of Prince William and Catherine Middleton: The wedding of Prince William, Duke of Cambridge, and Catherine Middleton took place on 29 April 2011 at Westminster Abbey in London, United Kingdom. The groom, Prince William, Duke of Cambridge, is the eldest son of Charles, Prince of Wales and Diana, Princess of Wales, and second, after his father, in line to succeed his paternal grandmother, Queen Elizabeth II.
Document 13: Prince William Cup: The Prince William Cup was created in 2007 by the Welsh Rugby Union and celebrates 100 years of rugby union history between Wales and South Africa. It is named after the Vice Royal Patron of the WRU, Prince William, Duke of Cambridge, who presented the cup, amid much booing from the Millennium Stadium crowd, to the inaugural winners of the trophy in the inaugural Prince William Cup match held at the Millennium Stadium in Cardiff on Saturday 24 November 2007.
Document 14: Princess Charlotte of Cambridge: Princess Charlotte of Cambridge (Charlotte Elizabeth Diana; born 2 May 2015) is the younger child and only daughter of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge. She is fourth in line of succession to the British throne, after her paternal grandfather, her father, and her elder brother.
Document 15: Prince William, Duke of Cambridge: Prince William, Duke of Cambridge, {'1': ", '2': ", '3': ", '4': "} (William Arthur Philip Louis; born 21 June 1982) is the elder son of Charles, Prince of Wales, and Diana, Princess of Wales. He is second in the line of succession to the British throne, after his father.
ground_truth: 14 November 1948