Jackie Stallone, mother of Hollywood actor Sylvester Stallone, has died at the age of 98.Another son, the singer Frank Stallone, confirmed news of her death and paid tribute to a "remarkable woman".She died on Monday "in her sleep as she had wished," he wrote in a social media tribute.He said: "It was hard not to like her, she was very eccentric and flamboyant person."Her mind was as sharp as a razor till the day she died.