Dahl was born on 20 April 1955 at
Doctors Hospital, New York City, and grew up in the Buckinghamshire village of
Great Missenden. She was named for
Olivia, the heroine of
William Shakespeare's
Twelfth Night, a favorite play of her mother's. Her middle name, Twenty, originated from the date of her birth, and the fact that her father had $20 in his pocket when he saw her in the hospital for the first time. Neal "struggled" with Olivia shortly after her birth but found her behavior transformed after spending a few weeks with her paternal aunt, Elsie Logsdail. Roald Dahl constructed his writing hut in the orchard of the couple's
Gipsy House for peace and quiet to write after her birth. Olivia came home from her school, Godstowe Preparatory School, in November 1962 with a note informing her parents of an outbreak of measles. Neal contacted her brother-in-law,
Ashley Miles, who sent them
gamma globulin, then common in the United States, to boost children's immunity against measles. Miles only provided a small amount, which the Dahls used for their son, Theo. Neal recalled in her autobiography,
As I Am, that Miles said "Let the girls get measles...It will be good for them". Olivia subsequently contracted measles, and had a mild fever for a few days before suffering convulsions after growing increasingly lethargic. She quickly became unconscious and was rushed to
Stoke Mandeville Hospital where she died the next day. Neal recalled that a doctor rang to abruptly tell her that Olivia was dead, and she "couldn't believe how cold he was". Neal later regretted not seeing Olivia after her death, having been persuaded not to by her sisters-in-law. According to Neal, her husband "really almost went crazy" with Neal keeping the family together for the sake of their two other children. Neal's grief was helped by talking about Olivia, whereas Roald kept silent about her until his own death in 1990. Olivia was survived by her siblings
Theo (born 1960) and
Tessa (born 1957). The Dahls' fourth and fifth children,
Ophelia and
Lucy, were born in 1964 and 1965 respectively. Roald wrote an account of Olivia's death in a notebook which he kept in a drawer of his writing hut; it was discovered after his death 28 years later. Olivia was buried in the churchyard of St John the Baptist in
Little Missenden. Roald constructed a
rock garden on her grave. ==Legacy==