A child actor who made the transition to adult roles, Patrick Labyorteaux (sometimes credited as Patrick Laborteaux) is probably best known for his performances in the TV series "Little House on the Prairie" (NBC, from 1977-1981) and "JAG" (CBS, from 1997- ).Although Labyorteaux made his acting debut at the tender age of three, it wasn't until he was a more seasoned nine-year-old that he broke into film. In 1974, he landed the role of Peter, grandnephew to Lucille Ball's character, in the film "Mame", as well as a small part in the ABC TV-movie "Only With Married Men". After numerous