Yes, they are. Peter is 11th in line, Zara is 12th.
Zara Phillips and Prince Henry are Cousins, Zara Phillips is the daughter of Princess Anne, Princess Royal and Prince Henry is the son of Prince Charles, Prince of Wales, Princess Anne and Prince Charles are the second and first child respectively of Queen Elizabeth II.
Mia Tindall (born 17 January 2014) is 17th in the line of succession to the British throne. She is the daughter of Zara Phillips (16th) and her husband Mike Tindall. The granddaughter of the current Princess Royal of the United Kingdom, Princess Anne, (12th) who is the daughter of our sovereign Queen Elizabeth II.
Queen Elizabeth II has three great-grandchildren. Peter Phillips, the son of her daughter Princess Anne and his wife Autumn are the parents of Savannah Phillips (born December 29, 2010) and Isla Phillips (born March 29, 2012). Queen Elizabeth's grandson Prince William, Duke of Cambridge (son of Prince Charles), and his wife Catherine, Duchess of Cambridge, have a son, George Alexander Louis, Prince of Cambridge, who is third in line to the throne.
Queen Elizabeth II's eldest grandchild is Peter Mark Andrew Phillips. He was born on 15th November 1977 and is the son of the Queen's only daughter, Princess Anne, and her first husband Mark Phillips. He is currently 11th in line to the British Throne.
AnswerHis Royal Highness The Prince James of Wessex, Viscount Severn, son of Prince Edward, born 2007
Charles Armstrong-Jones born 1st July 1999 son of Viscount and Viscountess Linley, grandson of George V1
Zara Tindall (née Philips) is the daughter of Princess Anne, the Princess Royal, and is 20th in the line of succession to the British throne. She is the granddaughter of Queen Elizabeth II and is also the niece of King Charles III. Her position in the line of succession reflects the changes made by the Succession to the Crown Act 2013, which ended male-preference primogeniture.
It is unlikely, for Zara Phillips to become queen 13 people would have to die before her. Monarch: Queen Elizabeth II (Born 21 April 1926) 1st in line: Prince Charles, The Prince of Wales(Oldest son of the Monarch, born 14 November 1948) 2nd in line: Prince William of Wales (First son of Charles born 21 June 1982) 3rd in line: Prince Henry of Wales (Second son of Charles born 15 September 1984) 4th in line: Prince Andrew, Duke of York (Second son of the Monarch, Born 19 February 1960) 5th in line: Princess Beatrice of York (elder daughter of Andrew, Born 8 August 1988) 6th in line: Princess Eugenie of York (younger daughter of Andrew Born 23 March 1990) 7th in line: Prince Edward, Earl of Wessex (youngest child of the monarch, Born 10 March 1964) 8th in line: James, Viscount Severn (son of Edward, Born 17 December 2007) 9th in line: Lady Louise Windsor (daughter of Edward, Born 8 November 2003) 10th in Line: Princess Anne, The Princess Royal (daughter of the Monarch, Mother of Zara, Born 15 August 1950) 11th in line: Peter Phillips (son of Anne, Brother of Zara, Born 15 November 1977) 12th in line: Zara Phillips (daughter of Anne, Born 15 May 1981)
There is no "English Throne." The title "King (or Queen) of England" has not existed since 1707. England is a part of, but the same as, The United Kingdom of Great Britain and Northern Ireland. The person who is tenth in line to the throne of The United Kingdom of Great Britain and Northern Ireland is Her Royal Highness The Princess Anne. See the related question links below.
Queen Elizabeth II has three great-grandchildren. Peter Phillips, the son of her daughter Princess Anne and his wife Autumn are the parents of Savannah Phillips (born December 29, 2010) and Isla Phillips (born March 29, 2012). Queen Elizabeth's grandson Prince William, Duke of Cambridge (son of Prince Charles), and his wife Catherine, Duchess of Cambridge, have a son, George Alexander Louis, Prince of Cambridge, who is third in line to the throne.
The youngest person in the British royal family is Savannah Phillips. She is the daughter of Peter Phillips (Queen Elizabeth's first grandchild). Savannah was born on the 29th of December 2010 (16 days ago) and is 12th in line to the throne (and hopefully never moves upwards).
Prince William is second in line for the throne, after his father Prince Charles.