Prince William and his wife Kate released their first official family photographs featuring their newborn son on Monday. The photographs, which were taken at Kate's family's Bucklebury home by her father, Michael Middleton, earlier this month. In the two released pictures, Prince George, who is third in line to the throne, sleeps soundly in his mother's arms. Lupo, the family's black cocker spaniel, also posed in a photograph with the new prince. In his first interview since George's birth in late July, William called his young son "a rascal" and admitted that fatherhood has changed him. *The Associated Press contributed to this report.