Mohammed Karrar's brother Bassam was also found guilty of rape and conspiracy to rape girls under 13, child prostitution and trafficking.
Fighting broke out in the dock after two of the defendants were cleared.
More top news
The first British boxer to win an Olympic gold medal beat Andre Dirrell in Boston last night to fight his way into the history books.
Louis Walsh reignites the flames of his row with by claiming she would refuse to be an X Factor judge if Nicole Scherzinger returns.
Ex Army chief calls on Government to "think the previously unthinkable" and consider sending ground troops to combat Islamic State.