Emma Jones, daughter of US pastor Terry Jones who is threatening to burn copies of the Koran, said in an interview with the German news website Spiegel Online that she begged him in an e-mail, "Papa, don't do it," but he did not answer.
"My father is not one to give up," said Emma Jones, 30. "As a daughter, I see the good-natured core inside him. But I think he needs help."
"I think he has gone mad," she added.
She said she hasn't had contact him with since 2008, when he was ousted by members of a church he had founded in Cologne, Germany.