Kriston - i have no good advice, but I wish you luck! Reading through this post, I was thinking that DS4 doesn't really lie very much, but he did have his moments. He's not a good liar, so we called him out on it and he would fess up.
In one area - preschool - DS4 has always made up stories about what he did and he will not tell us what he really did. Since these stories were obviously intended to be funny, I didn't consider this lying really, but maybe he's a liar by omission! (We only learn what's going on in preschool from newsletters and other kids and things in the backpack.)
I do remember being an excellent liar as a little kid. When my big brother and I were up to no good, only he would end up get the blame and the punishment because I was so very good at lying. I was very naughty and could get the tears flowing... Very effective! I grew up to be a person who cannot do anything even remotely dishonest.
