Siblings who control the $35 billion (revenues) Essar Group, an oil, power and steel conglomerate, and are said to be weighed down by a mountain of debt, saw shares of their Mumbai-listed Essar Oil rise on news that they are close to concluding the sale of a 49% stake to Russian oil producer Rosneft. The deal, which reportedly values the Indian refiner at $6 billion-plus, includes an agreement by Rosneft to supply 10 million barrels of crude to Essar annually for 10 years.