Mordashov, 53, made the bulk of his $19.8 billion fortune from steelmaker Severstal PJSC. : Alexey Mordashov’s children are quickly climbing the ranks of the world’s wealthiest, even as one of them just emerged from his teens. The country’s fourth-richest man transferred some of his holdings last week in European tour operator TUI AG, worth $890 million, to his sons Kirill, 20, and Nikita, 19. In February, he gave them a 65% stake in gold producer Nordgold valued at $780 million.