My 14 yr old DS does not seem to be able to stop lying to me. Mainly to get out of doing things he doesn't want to do. His lies are so transparent, it's not difficult to catch him out. He's just made up an elaborate story about yes, he's taken the dog for a walk when he obviously hasn't. Stupid, little stuff. Why? It's so pointless! He lies about almost everything until I just don't know what to believe any more. I know it doesn't seem like much but there appears to be no trust at all between me and him. Is it my fault?