Timur Kulibayev is one of the richest and most powerful businessmen in Kazakhstan. He’s also married to the daughter of the country’s former strongman leader Nursultan Nazarbaev, Dinara.

Kulibayev was a senior manager at state entities that controlled the country’s vast energy and mineral resources for more than a decade. In 2010, Swiss authorities investigated him for money laundering, but dropped the case after Kazakh financial police said there wasn’t sufficient evidence to prosecute.

Lawyers for the Kulibayevs engaged with reporters but did not provide a response for publication.