The family of one of the youngest prisoners ever held at Guantanamo plans to sue the U.S. government to compensate him for mistreatment and an adolescence lost to nearly seven years in a cell, his lawyers said Thursday.

Mohammed Jawad returned to Afghanistan this week after a military judge ruled that he was coerced into confessing that he threw a grenade at an unmarked vehicle in the capital in 2002. The attack wounded two American soldiers and their interpreter.