So as a taster, little potted biographies
Nancy - eldest, found to be quite caustic and challenging by many which led her to be unlucky in love, so when her younger sister got married she faked an engagement to a gay man out of pique. Eventually went on to have an unhappy marriage elsewhere, fertility issues and then became the long term mistress of a French general. Was great friends with Evelyn Waugh, Cecil Beaton and many great and good
Diana - one of the original Bright Young Things, married the Guinness heir and then left him scandalously for married man Oswald Mosley when still in her 20s. They became reviled British fascists, Hitler was at their wedding and they spent the duration of the war in Holloway Prison for treason. Subsequent official secrets reveal Nancy reported them but Diana never knew. Afterwards they had to live abroad because they were pariahs and no school would admit their children.
Pamela - the quiet one but Sir John Betjeman proposed to her twice (she refused !)
Unity, the famously Nazi one who went to live in Germany in the 30s, and was very much part of the entourage. At the outbreak of the war she attempted suicide by gunshot and survived. This left her incapacitated and with emotional and behavioural problems before eventually succumbing to an infection from the bullet still in her skull. Hitler himself arranged for her to be sent toSwitzerland and her mother and youngest sister had to trek to get her in the days before commercial air.
Jessica - ran away as a teenager and married her second cousin, who was believed to be the lovechild of Winston Churchill - their determination to live as common people caused their first child to die from a measles outbreak in the slums. Her husband was killed in the war, but they had moved to the US by this stage. She then became known as a civil rights campaigner in the States and was close to the likes of Maya Angelou. She became so different to her sisters they barely understood her and were often scathing about her. She blamed Diana for what happened to Unity and they died unreconciled.
Debo - the best one, big pals with Prince Charles and he stayed with her after the skiing accident that killed his friends. No fan of Diana. Lots of celeb pals. Sister in law was JFKs sister and he visited them at Chatsworth as that's where she's buried. She also attended his funeral in a private plane with the Duke Of Ed and the Prime Minister. Related to I think two or three prime ministers. Married the second son, but upon the death of his brother became Duchess Of Devonshire. made Chatsworth what it is today.
And that's the short version!