Lumpy is the son of Malla and Chewbacca, and the grandson of Itchy.  He doesn't always do what Malla and Itchy tell him to do, so he seems troubled most of the time.  He's very whiney.  He constantly bothers his relatives, and even when the Imperials besearch the Wookiees' treehouse, Lumpy doesn't do what they say, and one time even bites one of the Imperials' fingers.  Seeing a smaller version of Chewbacca was very funny, although 15 minutes into the show you grow tired of him.