^^^^By 'God role-models' I meant GOOD role-models'!!!
I agree with aim7407 here, as an addition it may be helpful to tell him a story or show him a film that contains strong morals about lying. God role-models are important and this does not really have to be role-models who are well known for 'not lying', I think that would be too difficult, but at his age I am sure he may be interested in stories from history or historical/modern role-models (such as Mandela etc), if you can interest him in people who have stood up against adversity you may be able to show him that these people stood up against societies lies. These kind of interests can 'save' a young man from flling into the trap of lying for personal gain. Hope I made sense! Its a crazy suggestion but might be helpful!
Hey there, I feel for you. It sounds a real shame that your step son's Mom is lying constantly. And you're right in stating that if he sees her do this, it's only rational that he'll think it's acceptable not because he doesn't know right from wrong, I think he knows lying is wrong, but because she does it, and gets away with it, so he figures he can too. I think the counseling is a good idea, as those people are well trained at how to reach children. In the mean time, you pointed out that you catch him in lies, and are absolutly certain he's lying, and if that's the case, whether he owns up to it and admits it or not, you still need to punish him. The next time he lies, I would tell him, even when he denies it, that since he has lied so many times, he has broken the trust in the relationship, and that you are going to punish him. I would take away priveleges, such as TV , video games, ground him, or any other way you can think of to let him know he can't lie and get away with it. If you're sure he's lying don't listen to him when he says you can't punish him because he's telling the truth. He'll try to weasel his way out of it, but if he sees that no matter how much he lies, there are continual concequences for this, maybe he'll change his behavior. I know you only have him a limited time like you said on the weekends, but even if it's just while he's there for the weekend, try to remain vigilant in teaching him this lesson. If you have a family outing planned, or something special planned for him, and he lies, let him know that he won't be going or doing, if he lies. And stand firm, don't let him cry or beg his way out of being punished. I hope this helps, good luck