William and Catherine's attendants

Clarence House today released the names of the Prince William and Cattherine Middleton's attendants.
http://www.telegraph.co.uk/news/uknews/royal-wedding/8323003/Prince-William-best-man-to-be-brother-Harry.html
Prince Harry will be Prince William's best man.   Catherine has chosen her sister, Philippa Middleton, as her maid of honor.  She will also be attended by four bridesmaids and two page boys.   The bridesmaids are Lady Louise Windsor, 7-year-old daughter of the Earl and Countess of Wessex,  the Hon. Margarita Armstrong-Jones, the 8 year-old daughter of  Viscount and Viscountess Linley,  three-year old Grace van Cutsem and three-year-old Eliza Lopes.   Grace is the daughter of Mr and Mrs. Hugh van Cutsem. She is Prince William's goddaughter.   Eliza Lopes is the daughter of Mr. and Mrs. Harry Lopes.  Mrs. Lopes is the former Laura Parker-Bowles, William's stepsister.   Little Eliza is the Duchess of Cornwall's granddaughter.
Two two pages are Master William Lower-Pinkerton, 10, the son of  Prince William and Prince Harry's private secretary, and Master Tom Pettifer, son of Mr. and Mrs. Charles Pettifer.  Mrs. Pettifer is the former Alexandra "Tiggy" Legge-Bourke, who worked briefly as William and Harry's nanny after the death of their mother.   Prince William is Tom's godfather.

Grace van Cutsem's uncle, Edward, served as a page at the wedding of Prince William's parents, the Prince of Wales and Lady Diana Spencer.

Miss Middleton does not have any godchildren (yet), nieces or nephews or young cousins. None of the attendants come from William's maternal family. He did not include anyone from his mother's side of the family.  He has 12 first cousins on his mother's sister.  Lady Sarah McCorquodale and Lady Lady Jane Fellows each have three children, all of whom were born in the 1980s.  The Earl Spencer has six children.  The first four of his children, Lady Kitty, Lady Eliza, Lady Amelia and Lord Althorp, were born in the early 1990s.  They live in South Africa with their mother, Victoria, although Lady Kitty has been dividing her time doing fashion shoots and attending parties in London and in Johannesburg. 
Lord Spencer also has two children, the Hon. Edmund Spencer, 7, and four-year-old Lady Lara Spencer, who live with their mother, Caroline, in London.
Lord Spencer's second marriage ended in acrimony.  It is unlikely that Prince William knows his youngest first cousins.  Although it is said that Prince William has a warm relationship with his two aunts, and their children, he is not as close to Uncle Charles and his family. 
It is expected that all three of Diana's sisters and their children (apart from the two youngest ones) will receive invitations to the wedding ceremony.

Kate Middleton attended the wedding of Laura Parker-Bowles and Harry Lopes in 2006.   Lopes is the son of the Hon. George Lopes and the Hon. Sarah Astor, and is, thus, the grandson of the 2nd baron Rosborough and the 2nd Baron Astor of Hever.   Sarah is a kinswoman of Rose Astor,  the mother of Grace van Cutsem.  Rose Nancy Langhorne Astor is the youngest of four children of David Waldorf Astor, eldest child of the Hon. Michael Langhorne Astor.  
The Hon. Michael Astor was the fourth children of the American-born William Waldorf Astor, 2nd Viscount Astor, and Nancy Witcher Langhorne, a native of Danville, Virginia.   Lady Astor was the first woman Member of Parliament to take her seat.
There are two separate Astor titles in the United Kingdom.  William Waldorf Astor, a member of a very prominent Astor family in the United States, was the richest man in America.  A lawyer by training, he served in the New York State Assembly, but after he was defeated in a re-election bid, Astor was named as ambassador to Italy by President Chester A. Arthur.
In 1890,  William began the building of the Waldorf Hotel.  His cousin, John Jacob Astor IV, building a competing hotel, known as the Astoria, in 1897.  The hotel then became known as the Waldorf - Astoria Hotel.
After a family feud with his aunt Caroline Schermerhorn Astor, William moved his family to England, where he purchased a home, Cliveden.  In 1899,  Astor became a British subject.  Four years later, he purchased Hever Castle, in Kent.  
In 1905, William gave Cliveden to his eldest son,Waldorf, and his wife, Nancy, as a wedding present.   William's wealth was much appreciated in England, and he donated to many charities.  In 1916, he was created Baron Astor of Hever Castle.  Six months later, he was created Viscount Astor.
Hever Castle was inherited by Lord Astor's fourth child, John Jacob Astor, who married Lady Violet Elliot-Murray-Kynynmound, daughter of the 4th Earl of Minto.    In 1956, he was created Baron Astor of Hever Castle.  His eldest son, Gavin, who succeeded in 1971 as the second Baron Astor of Hever, married Lady Irene Haig, daughter of the 1st Earl of Haig,  The Hon. Sarah Astor is their third daughter.
Grace van Cutsem and Eliza Lopes are direct descendants of Johann Jakob Astor and Sarah Todd. Astor was born in 1763 in Walldorf, Germany.   He was only 16 when he moved to London to work for his brother, a flute maker.  After the end of the American revolution,  Johann Jakob emigrated to the United States, where he established a fur trading empire.  He created a diversified empire, and at the time of his death in 1848, he was the richest man in America.
In New York, the Astor family was at the center of the society.  The male line in the American branch is now extinct, but the family thrives in the United Kingdom.