12 year old lying and stealing

Well it seems to me the honeymoon period has ended. Your long road has likely just begun. I think my kids were around 9 months too. Um...what can I say, there is not much you can do except continuously check, check ,check but they get crafty, more craftier than you would ever imagine. They can fool anybody and he is 12, you should see what my daughter could steal and hide and lie about it at age 4. If you find an answer be so sure to let me know. In the mean time you need to find ways to not let this get to you. I had a friend who simply did pocket checks every time he left our house knowing that there was likely stuff hidden. And there always was. She never gives up. Amazingly he never gets mad. He just makes his daughter give it back and they go on their merry way. I wish I could be so patient.