First of all, chat, let the child trust you and enter his world. Only a good parent-child relationship can effectively educate children.
Second, after the child is willing to open his heart to you, understand why the child wants to take the money and what is the purpose. If it is a good purpose, it means that the child is still kind. Maybe there is no one to guide him and he doesn't know how to get money in the right way and realize his wishes.
Third, we should educate children from an early age that they can get their own things through their own labor, so that children can understand that their own things are dominated by themselves and other things can only be taken after permission. Set a principle for children, let him know what is their own, what is others', what to take and what not to take, whether at home or in front of outsiders. The premise is that you should respect your child's own rights. If it's his own toy, let him take care of it. You can't deprive the child of the right to make his own decisions without authorization. For example, even if the child doesn't play with a toy at ordinary times, you can't come at home, and other babies will take it out for others to play with. This is disrespect for others! Children are equal to us adults. When you take his things, you must ask the child if he wants to. If you don't want to, guide him to discuss with her. Only in this way can your children grow up to be independent, confident, brave, not cowardly and upright.