Is it common for 9 year olds to go through a phase of lying? My son is currently lying about everything, hurting his sister, being in the garden when he should have been in bed (we saw him through the window and still he lied!!!) and tonight he has drawn on his sisters bedroom wall and is now lying about it. I am at a loss, not only is the drawing on the wall completely unacceptable and the kind of thing I would expect from a toddler but he is lying again!!!! He has now lost computer time for tomorrow and I am thinking of making him repaint that bit of wall (I'm a bit concerned he may make more of a mess) but I don't know what to do about the lying. Is it just a phase that will pass?