Both Slavica and Bernie come from working-class backgrounds. Bernie started out selling pens at Petticoat Lane market, and Slavica, who ended up modelling for Armani, is the daughter of a factory worker and a fireman. 'She always taught me about the value of money,' says Petra. 'We never just got presents, we had to earn them. So if I got good grades at school, or won a netball match, I'd be taken shopping.' At home, Slavica insisted on washing up by hand, did the family's ironing, and cooked supper herself every night. 'My parents dedicated their whole lives to me and my sister,' says Petra. 'My dad always made time for us, however hard he worked, and even if he had a crap day at the office, he would never take it out on us.'