Diana certainly came from a dysfunctional family herself .
"When Diana was 14, her father became the eighth Earl Spencer, following the death of his own father, and the Spencers moved to the family seat, Althorp. The following year, in 1976, he married Raine, Countess of Dartmouth, the daughter of romantic novelist Barbara Cartland (Diana's mother Frances had married Peter Shand Kydd in May 1969)."
Coincidentally Camilla's maiden was Shand. No relation!