Question: Who is the spouse of Prince Edward, Earl of Wessex's mother?

Knowledge 1: Prince Edward, Earl of Wessex
Prince Edward, Earl of Wessex, (Edward Antony Richard Louis; born 10 March 1964) is the youngest of four children and the third son of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. At the time of his birth, he was third in line of succession to the British throne; he is 11th. The Earl is a full-time working member of the British royal family and supports the Queen in her official duties – often alongside his wife, the Countess of Wessex – as well as undertaking public engagements for a large number of his own charities. In particular he has assumed many duties from his father, the Duke of Edinburgh, who retired from public life in 2017. Prince Edward succeeded Prince Philip as president of the Commonwealth Games Federation (vice-patron since 2006) and opened the 1990 Commonwealth Games in New Zealand and the 1998 Commonwealth Games in Malaysia. He has also taken over the Duke's role in the Duke of Edinburgh's Award Scheme. [SEP] Knowledge 2: Wedding dress of Princess Elizabeth
The wedding dress of Princess Elizabeth was worn by the future Queen Elizabeth II at her wedding to Philip Mountbatten, Duke of Edinburgh on 20 November 1947 in Westminster Abbey. Given the rationing of clothing at the time, she still had to purchase the material using ration coupons. The dress was designed by Norman Hartnell. Hartnell's signature was said to be embroidery, and he enjoyed "working with soft, floating fabrics, particularly tulle and chiffon, and with plain, lustrous silks". The dress was made of soft Damascus Prokar, with a high neckline, tailored bodice and a short train.
Knowledge 1: Prince Edward, Earl of Wessex
Prince Edward, Earl of Wessex, (Edward Antony Richard Louis; born 10 March 1964) is the youngest of four children and the third son of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. At the time of his birth, he was third in line of succession to the British throne; he is 11th. The Earl is a full-time working member of the British royal family and supports the Queen in her official duties – often alongside his wife, the Countess of Wessex – as well as undertaking public engagements for a large number of his own charities. In particular he has assumed many duties from his father, the Duke of Edinburgh, who retired from public life in 2017. Prince Edward succeeded Prince Philip as president of the Commonwealth Games Federation (vice-patron since 2006) and opened the 1990 Commonwealth Games in New Zealand and the 1998 Commonwealth Games in Malaysia. He has also taken over the Duke's role in the Duke of Edinburgh's Award Scheme. [SEP] Knowledge 2: Elizabeth II
Name Birth Marriage Their children Their grandchildren Date Spouse Charles, Prince of Wales 14 November 1948 29 July 1981 Divorced 28 August 1996 Lady Diana Spencer Prince William, Duke of Cambridge Prince George of Cambridge Princess Charlotte of Cambridge Prince Henry of Wales None 9 April 2005 Camilla Parker Bowles None Anne, Princess Royal 15 August 1950 14 November 1973 Divorced 28 April 1992 Mark Phillips Peter Phillips Savannah Phillips Isla Phillips Zara Tindall Mia Tindall 12 December 1992 Timothy Laurence None Prince Andrew, Duke of York 19 February 1960 23 July 1986 Divorced 30 May 1996 Sarah Ferguson Princess Beatrice of York None Princess Eugenie of York None Prince Edward, Earl of Wessex 10 March 1964 19 June 1999 Sophie Rhys - Jones Lady Louise Windsor None James, Viscount Severn None
Knowledge 1: Lady Louise Windsor
Lady Louise Windsor (Louise Alice Elizabeth Mary Mountbatten-Windsor; born 8 November 2003) is the elder child and only daughter of Prince Edward, Earl of Wessex, and Sophie, Countess of Wessex. She is the youngest granddaughter of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. She is 13th in the line of succession to the British throne. [SEP] Knowledge 2: Elizabeth II
Name Birth Marriage Their children Their grandchildren Date Spouse Charles, Prince of Wales 14 November 1948 29 July 1981 Divorced 28 August 1996 Lady Diana Spencer Prince William, Duke of Cambridge Prince George of Cambridge Princess Charlotte of Cambridge Prince Henry of Wales None 9 April 2005 Camilla Parker Bowles None Anne, Princess Royal 15 August 1950 14 November 1973 Divorced 28 April 1992 Mark Phillips Peter Phillips Savannah Phillips Isla Phillips Zara Tindall Mia Tindall 12 December 1992 Timothy Laurence None Prince Andrew, Duke of York 19 February 1960 23 July 1986 Divorced 30 May 1996 Sarah Ferguson Princess Beatrice of York None Princess Eugenie of York None Prince Edward, Earl of Wessex 10 March 1964 19 June 1999 Sophie Rhys - Jones Lady Louise Windsor None James, Viscount Severn None

Answer: Philip Mountbatten