The Supreme Warlord

The book is about an older gentleman who is kidnapped with his family by aliens. As it turns out, he is the descendant of the supreme warlord of the Intergalactic Federation of Planets! The new warlord has extreme powers, such as conveying his words mentally rather than orally. He can leave his body, thereby enabling him to move about in extraterrestrial form! He can enter someone's mind with his own and be able to remove and replace orders given to the subject.