Family
- grandmother Penelope Aitken:
- great-grandfather Lord Rugby: Maternal great-grandfather
- grandfather Bill Aitken: Served as a member of Parliament
- father Nigel Davenport: Divorced from Maria Aitken c. 1979
- mother Maria Aitken: Divorced from Nigel Davenport c. 1979; assumed guardianship of brother's children after his incarceration
- step-father Patrick McGrath: Married Jack's mother Maria Aitken
- uncle Jonathan Aitken: Appointed Chief Secretary to the Treasury under Prime Minister John Major; resigned in 1995, to defend himself against accusations that whilst serving as Minister of State he violated ministerial rules by allowing an Arab businessman to pay for his stay in the Paris Ritz; charged with perjury and perverting the course of justice, and in 1999 was jailed for 18 months; also published the biography, Nixon: A Life (1993), of former US President Richard Nixon
