1. Lucy Jackson, 37

Samantha’s glamorous half-sister Lucy is a real party girl – according to the Ceffin website. It says she ‘swears by a good pair of ankle boots and sequined bag for maximum revelry’. She works in film post-production and married her TV producer husband Thomas in 2011 near the Sheffield family seat of Sutton Park in North Yorkshire, arriving in a horse and carriage. 

2. Lohralee Astor, 38

Canadian Lohralee is perfect for the job – she’s a former fashion model who was once a face of the trendy Diesel brand. Another society girl, she met husband William Astor, heir to the Astor dynasty, in Raffles nightclub on London’s Kings Road. These days the mother-of-four gives nutritional advice to parents through her book Feeding The Future. 

3. Flora Astor, 42

Jewellery designer Flora, likes to lend a hand to the family firms – she used to work for Lady Annabel Astor’s home accessories company OKA, before moving to the South of France with her family. Now a qualified ‘gemologist’, Flora married diplomat Theo Rycroft in 2006, and they have three children. Glamour-wise, Cefinn’s website reveals that Flora loves ‘a signature red lip’. 

4. Alice Cadestin, 38

Alice caused a media sensation when, before her 2013 wedding, a snap was taken of her with David Cameron asleep on a bed with his red Cabinet box. It went viral after Sam’s full sister Emily posted the shot on Instagram. Alice’s French husband Etienne’s family owns the Esterlin Champagne house – and she likes to mix the bubbly with grapefruit juice, Grand Marnier and rose water. 

Read more at DailyMail.co.uk