 Khrapunov and Mukhtar Ablyazov are alleged to have stolen $4 billion from BTA Bank through a complicated web of embezzlement, corrupt deals and offshore shell companies.The two are co-defendants in a suit that they conspired together to launder $40 million of stolen money by investing in New York City real estate deals.Khrapunov is the father-in-law of Ablyazov's daughter, Madina.