Some context: Melungeon ( m@-LUN-j@n) is a term traditionally applied to one of numerous "tri-racial isolate" groups of the Southeastern United States. Historically, Melungeons were associated with the Cumberland Gap area of central Appalachia, which includes portions of East Tennessee, Southwest Virginia, and eastern Kentucky. Tri-racial describes populations thought to be of mixed European, African and Native American ancestry. Although there is no consensus on how many such groups exist, estimates range as high as 200.
According to the principle of partus sequitur ventrem, which Virginia incorporated into law in 1662, children were assigned the social status and ethnicity of their mother, regardless of their father's ethnicity or citizenship. This meant the children of African slave mothers were born into slavery. But it also meant the children of free white or mulatto women, even if fathered by enslaved African men, were born free. The free descendants of such unions formed many of the oldest free families of color. Early colonial Virginia was very much a "melting pot" of peoples, and some of these early multiracial families were ancestors of the later Melungeons. Each family line has to be traced separately. Over the generations, most individuals of the group called Melungeon were persons of mixed European and African descent, whose ancestors had been free in colonial Virginia.  Edward Price's dissertation on Mixed-Blood Populations of the Eastern United States as to Origins, Localizations, and Persistence (1950) stated that children of European and free black unions had intermarried with persons of Native American ancestry. These conclusions have been largely upheld in subsequent scholarly and genealogical studies. In 1894, the U.S. Department of the Interior, in its "Report of Indians Taxed and Not Taxed," noted that the Melungeons in Hawkins County "claim to be Cherokee of mixed blood". The term Melungeon has since sometimes been applied as a catch-all phrase for a number of groups of mixed-race ancestry.  In 2012, the genealogist Roberta Estes and her fellow researchers reported that the Melungeon lines likely originated in the unions of black and white indentured servants living in Virginia in the mid-1600s before slavery became widespread. They concluded that as laws were put in place to prevent the mixing of races, the family groups could only intermarry with each other. They migrated together from western Virginia through the Piedmont frontier of North Carolina, before settling primarily in the mountains of East Tennessee.
What classified their origin ?
A: Each family line has to be traced separately.
Some context: Mortimer was born in Hampstead, London, the only child of Kathleen May (nee Smith) and Clifford Mortimer, a barrister who became blind in 1936 when he hit his head on the door frame of a London taxi but still pursued his career. Clifford's loss of sight was not acknowledged openly by the family. John Mortimer was educated at the Dragon School in Oxford and Harrow School, where he joined the Communist Party, forming a one-member cell. Originally Mortimer intended to be an actor (his lead role in the Dragon's 1937 production of Richard II gained glowing reviews in The Draconian) and then a writer, but his father persuaded him against it, advising: "My dear boy, have some consideration for your unfortunate wife...
With weak eyes and doubtful lungs, Mortimer was classified as medically unfit for military service in World War II. He worked for the Crown Film Unit under Laurie Lee, writing scripts for propaganda documentaries.  I lived in London and went on journeys in blacked-out trains to factories and coal-mines and military and air force installations. For the first and, in fact, the only time in my life I was, thanks to Laurie Lee, earning my living entirely as a writer. If I have knocked the documentary ideal, I would not wish to sound ungrateful to the Crown Film Unit. I was given great and welcome opportunities to write dialogue, construct scenes and try and turn ideas into some kind of visual drama.  He based his first novel, Charade, on his experiences with the Crown Film Unit.  Mortimer made his radio debut as a dramatist in 1955 with his adaptation of his own novel Like Men Betrayed for the BBC Light Programme. But he made his debut as an original playwright with The Dock Brief starring Michael Hordern as a hapless barrister, first broadcast in 1957 on BBC Radio's Third Programme, later televised with the same cast and subsequently presented in a double bill with What Shall We Tell Caroline? at the Lyric Hammersmith in April 1958 before transferring to the Garrick Theatre. It was revived by Christopher Morahan in 2007 as part of a touring double bill, Legal Fictions.  His play A Voyage Round My Father, given its first radio broadcast in 1963, is autobiographical, recounting his experiences as a young barrister and his relationship with his blind father. It was memorably televised by BBC Television in 1969 with Mark Dignam in the title role. In a slightly longer version the play later became a stage success (first at Greenwich Theatre in 1979 with Dignam, then a year later at the Theatre Royal Haymarket, now starring Alec Guinness). In 1981 it was remade by Thames Television with Laurence Olivier as the father and Alan Bates as young Mortimer. In 1965, he and his wife wrote the screenplay for the Otto Preminger film Bunny Lake is Missing, which also starred Olivier.
How did he adapt it?
A:
play