ruanne dellal says her husband jack was worth at least £ 400million .
the former beauty queen has launched a high court claim against his relatives , in which she claims the property tycoon must have given away vast chunks of his fortune in secret deals to his family .
mrs dellal is suing six of her husband 's children , including gabrielle , left , and jasmine , right .
mrs dellal , 61 , whose own assets have been valued at £ 41.5 million .