BBC.They are the world's richest brothers with a combined wealth of $85bn - and they are fighting again.
Two years ago, Mukesh Ambani and Anil Ambani, who control India's Reliance group of industries, accused each other of lying, misleading shareholders and delaying the process of dividing the businesses between them.
The latest rivalry between chief of Reliance Communications Anil Ambani and his elder brother Mukesh could upset a $70bn (£36bn;45bn euros) merger between Reliance Communications and the South African mobile telephone company, MTN.
There have been suggestions that Anil Ambani would sell a stake in Reliance Communications to MTN.
But Mukesh Ambani, India's richest man, says he has the first right to buy a stake in his younger brother's firm.
He says this is laid down in a family agreement. Anil Ambani says the agreement was never ratified.
What a couple of peckers