Harry David Wentworth-Stanley (b.1989) is the son of Nicholas Philip Wentworth-Stanley (b.1954) and Clare Husted Steel (b.1960). Nicholas and Clare married in 1985 and divorced in 1997. Harry has two siblings: James Wentworth-Stanley (1985-2006) and Louisa Wentworth-Stanley (b.1993). In 1997, Harry's mother Clare married George Mountbatten, 4th Marquess of Milford Haven (b.1961). Harry's stepfather is a descendant of Louis Mountbatten, 1st Marquess of Milford Haven (born Prince Louis of Battenberg) and Princess Victoria of Hesse. From his mother's second marriage, Harry gained two step-siblings: Lady Tatiana Mountbatten (b.1990) and Harry Mountbatten, Earl of Medina (b.1991).
Cressida Curzon Bonas (b.18 February 1989) is the only child of Jeffery Bonas and Lady Mary-Gaye Curzon (b.1947). Cressida's maternal grandparents are Edward Curzon, 6th Earl Howe, and Grace Wakeling. Jeffrey and Mary-Gaye were married in 1988 and divorced in 1994. Cressida has four half-siblings. From her mother's first marriage to Kevin Cooper-Key, Cressida has a sister, Pandora Cooper-Key (b.1973; married Matthew Mervyn-Jones). From her mother's second marriage to John Anstruther-Gough-Calthorpe, Cressida has two sisters and a brother: Georgiana Anstruther-Gough-Calthorpe (b.1978; married Robert Butler), Isabella Anstruther-Gough-Calthorpe (b.1980; married Sam Branson, son of Sir Richard Branson), and Jacobi Anstruther-Gough-Calthorpe (b.1983).