Question: how is Nicholas Llewelyn Davies and Peter and Wendy related?

full_context: Document 1: George du Maurier: George Louis Palmella Busson du Maurier (6 March 18348 October 1896) was a Franco-British cartoonist and author, known for his cartoons in "Punch" and for his novel "Trilby". He was the father of actor Sir Gerald du Maurier and grandfather of writers Angela du Maurier and Dame Daphne du Maurier. He was also the father of Sylvia Llewelyn Davies and grandfather of the five boys who inspired J.M. Barrie's "Peter Pan".
Document 2: Peter Llewelyn Davies: Peter Llewelyn Davies MC (25 February 1897 – 5 April 1960) was the middle of five sons of Arthur and Sylvia Llewelyn Davies, one of the Llewelyn Davies boys befriended and later informally adopted by J. M. Barrie. Barrie publicly identified him as the source of the name for the title character in his play "Peter Pan, or The Boy Who Wouldn't Grow Up". This public identification as "the original Peter Pan" plagued Davies throughout his life, which ended in suicide. He was the first cousin of the English writer Daphne du Maurier.
Document 3: Nicholas Llewelyn Davies: Nicholas "Nico" Llewelyn Davies (24 November 1903 – 14 October 1980) was the youngest of the Llewelyn Davies boys, who were the inspiration for J. M. Barrie's Peter Pan and the Lost Boys. He was only a year old when "Peter Pan, or The Boy Who Wouldn't Grow Up" hit the stage in 1904, and as such was not a primary inspiration for the characters of Peter and the Lost Boys. However he was eight years old when the novel adaptation "Peter and Wendy" was published, and in later editions of the play, the character Michael Darling's middle name was changed to "Nicholas." He was the first cousin of the English writer Daphne du Maurier.
Document 4: Llewelyn Davies boys: The Davies boys (the family only used the double surname Llewelyn Davies in formal contexts) were the sons of Arthur (1863–1907) and Sylvia Llewelyn Davies (1866–1910), the daughter of the French-born cartoonist and writer George du Maurier, and sister of actor Gerald du Maurier. The boys were the first cousins of Gerald's daughter, the author Daphne du Maurier. They were the inspiration for J. M. Barrie's Peter Pan, in which several of the characters were named after them.
Document 5: Jack Llewelyn Davies: John "Jack" Llewelyn Davies (11 September 1894 – 17 September 1959) was the second eldest of the Llewelyn Davies boys befriended by Peter Pan creator J. M. Barrie, and one of the inspirations for the boy characters in the story of Peter Pan. He served in the Royal Navy during World War I. He was the first cousin of the English writer Daphne du Maurier.
Document 6: Tinker Bell: Tinker Bell (Tink for short), is a fictional character from J. M. Barrie's 1904 play "Peter Pan" and its 1911 novelization "Peter and Wendy". She has appeared in multiple film and television adaptations of the Peter Pan stories, in particular the 1953 animated Walt Disney picture "Peter Pan". She also appears in the official sequel "Peter Pan in Scarlet" by Geraldine McCaughrean commissioned by Great Ormond Street Hospital as well as the "Peter and the Starcatchers" book series by Ridley Pearson and Dave Barry.
Document 7: Peter Pan: Peter Pan is a fictional character created by Scottish novelist and playwright J. M. Barrie. A free spirited and mischievous young boy who can fly and never grows up, Peter Pan spends his never-ending childhood having adventures on the mythical island of Neverland as the leader of the Lost Boys, interacting with fairies, pirates, mermaids, Native Americans, and occasionally ordinary children from the world outside Neverland.
Document 8: Peter Pan (1924 film): Peter Pan is a 1924 silent adventure film released by Paramount Pictures, the first film adaptation of the play by J. M. Barrie. It was directed by Herbert Brenon and starred Betty Bronson as Peter Pan, Ernest Torrence as Captain Hook, Mary Brian as Wendy, and Virginia Browne Faire as Tinker Bell. Anna May Wong, a groundbreaking Chinese-American actress, played the Indian princess Tiger Lily.
Document 9: George Llewelyn Davies: George Llewelyn Davies (20 July 1893 - 15 March 1915) was the eldest son of Arthur and Sylvia Llewelyn Davies. Along with his four younger brothers, George was the inspiration for playwright J. M. Barrie's characters of Peter Pan and the Lost Boys. The character of Mr. George Darling was named after him. He was killed in action in the First World War. He was the first cousin of the English writer Daphne du Maurier.
Document 10: Sylvia Llewelyn Davies: Sylvia Jocelyn Llewelyn Davies (25 November 1866 – 27 August 1910), "née" Sylvia du Maurier, was the mother of the boys who were the inspiration for the stories of Peter Pan by J. M. Barrie. She was the daughter of cartoonist and writer George du Maurier and his wife Emma Wightwick, the elder sister to actor Gerald du Maurier, the aunt of novelists Angela and Daphne du Maurier and a great-granddaughter of Mary Anne Clarke, royal mistress of Prince Frederick, Duke of York and Albany.
Document 11: Peter and Wendy: Peter Pan; or, the Boy Who Wouldn't Grow Up or Peter and Wendy is J. M. Barrie's most famous work, in the form of a 1904 play and a 1911 novel. Both versions tell the story of Peter Pan, a mischievous yet innocent little boy who can fly, and has many adventures on the island of Neverland that is inhabited by mermaids, fairies, Native Americans and pirates. Peter has many stories involving Wendy Darling and her two brothers, his fairy Tinker Bell, the Lost Boys, and the pirate Captain Hook. The play and novel were inspired by Barrie's friendship with the Llewelyn Davies family. Barrie continued to revise the play for years after its debut until publication of the play script in 1928.
Document 12: J. M. Barrie: Sir James Matthew Barrie, 1st Baronet, {'1': ", '2': ", '3': ", '4': "} ( ; 9 May 1860 19 June 1937) was a Scottish novelist and playwright, best remembered today as the creator of Peter Pan. He was born and educated in Scotland but moved to London, where he wrote a number of successful novels and plays. There he met the Llewelyn Davies boys, who inspired him to write about a baby boy who has magical adventures in Kensington Gardens (included in "The Little White Bird"), then to write "Peter Pan, or The Boy Who Wouldn't Grow Up", a "fairy play" about an ageless boy and an ordinary girl named Wendy who have adventures in the fantasy setting of Neverland.
Document 13: Peter Pan (1954 musical): Peter Pan is a musical based on J. M. Barrie's 1904 play "Peter Pan" and Barrie's own novelization of it, "Peter and Wendy". The music is mostly by Mark "Moose" Charlap, with additional music by Jule Styne, and most of the lyrics were written by Carolyn Leigh, with additional lyrics by Betty Comden and Adolph Green.
Document 14: Peter Pan (2003 film): Peter Pan is a 2003 American-British-Australian fantasy adventure film released by Universal Pictures, Columbia Pictures, and Revolution Studios. It was the first authorized and faithful film or television adaptation of J.M. Barrie's play "Peter Pan, or The Boy Who Wouldn't Grow Up" in half a century, after Disney's version in 1953. P. J. Hogan directed a screenplay co-written with Michael Goldenberg which is based on the play and novel by J. M. Barrie. Jason Isaacs plays the dual roles of Captain Hook and George Darling, Olivia Williams plays Mrs. Darling, while Jeremy Sumpter plays Peter Pan, Rachel Hurd-Wood plays Wendy Darling, and Ludivine Sagnier plays Tinker Bell. Lynn Redgrave plays a supporting role as Aunt Millicent, a new character created for the film.
Document 15: Peter Pan (Three Sixty Entertainment): Peter Pan is a stage production by Three Sixty Entertainment, of J. M. Barrie's 1904 play. It debuted as "Peter Pan in Kensington Gardens" in 2009, staged in Kensington Gardens of London, where Barrie originally conceived the character of Peter Pan. (Despite the title when presented in Kensington Gardens, the production's story is the famous play featuring Wendy Darling, not the book recounting Peter Pan's infancy, titled "Peter Pan in Kensington Gardens".)
ground_truth: play