Sit down and talk to your child, tell him the advantages and disadvantages of stealing money, and tell him that the pocket money he gives every month must be rewarded and punished. For example, you can give pocket money if you make progress in your studies, or you can't give pocket money if you make a mistake, but you can't give more. More importantly, whatever you do, you must tell your parents, then find a negative example to tell you what your child did when he stole money, and then tell you what he did wrong before, from now on. Strictly abide by the established system, ask your child what he wants at home, or what he bought with money, or someone asks your son for it on the way, so that parents have a good idea, otherwise they will not pay attention to stealing now, and it is not easy to manage every day. If your child is just in the first or second grade, he will check what your child bought every day, and now he knows how to steal money, so parents will pay attention to correcting it and catch up slowly.
In short, communicate with children often and ask them what they need to buy, what they should buy and why they shouldn't. Secondly, some parents like to have their own private money or coffers, and if their children know about it, they will follow suit, so sometimes the family should set an example. Have a heart-to-heart talk with him and tell a short story. You know you have less money without calling the roll. Then you should think about whether the living expenses you give your children are unreasonable.