Bernard Arnault is the richest person in the world and he has spent decades preparing his five children to run his luxury-brand empire, LVMH. WSJ’s Nick Kostov learned Arnault drilled his kids in mathematics, brought them along on business trips, inside negotiations and has elevated them into senior roles. But the question remains: who will succeed Arnault at the helm of the world’s biggest luxury conglomerate?  Further Reading: - The World’s Richest Person Auditions His Five Children to Run LVMH, the Luxury Empire  Further Listening: - How a Deal to Buy Tiffany Lost Its Sparkle  Learn more about your ad choices. Visit megaphone.fm/adchoices