About John Ferrier Turing
Alan Turing had an older brother, John, and his brother does have direct descendants. One of them wrote the following note:
" I thought you'd like to know that there are members of Alan Turing's family around (although not direct descendents).
He was my mother's uncle. Most of the family have not retained the name due to marriage, but my step-uncle is a Turing."
Other people wrote to say that they know of other family members
Turing's three nieces remembered him well, and he had a surviving nephew, they have many memories of their Uncle Alan. They even still had his teddy bear.