It is really necessary for our children who are minors to monitor their activities, not necessarily every move, it's like we should be aware of what they do, what they are interested in and of course the circles of friends they hang out with should we know, let's just do it in a minimal way, don't be super strict because as others say, a child becomes more rebellious if we restrict them too much, we also need to respect their privacy, that's why It would be good if we can build a good relationship between parents and children in them so that they themselves will tell stories or open up topics to their parents about their own lives.
We must monitor our children carefully if we don't wants to see them playing gambling like the other children because many children already playing gambling without their parents knows. We must knows and aware with their environment so we knows about their friends to monitor easily. We don't have to be super strict to them as they will not follow what we suggests them and yes, they will becomes rebellious if we do like that. We gives them a time to do whatever they wants but we always supervise them so they don't doing something that can makes them in trouble. If we can gets close to them, they will tells whatever they feels to us and shares many things to us so if they have a problem, they will asks us to helps them to solve it.
Even the kids is already growing we should take the time to monitor them, same with your statement, it's still part of our responsibilities to make sure that they are engaging to the right kind of environment, especially those who accompanying them, people that sorrounds them influence the most, so not just the family but more on their friends who have interactions with them, the types of influence that they bringing to our kids is very important to monitor.
A person must somehow understand that it is impossible to steal money. This is first of all. In addition, he must understand that one cannot play gambling without a system and without risk management. Each transaction must have a volume limit. If this is not the case, a bad future awaits the player. Of course, the child must be punished in some way. However, from the starting post it is not clear how old the child is. Is he already of age or not yet? But it is stupid for parents to sue their child. If the child is underage, then the punishment should be limited entertainment. And if the child is of age, then the punishment can only be limited to communication with such a son.
The lack of age information makes us think ambiguously in the matter between being old enough or not, maybe we can assume that the person concerned is not old enough, so it is unethical for a father to prosecute his underage child, we only need to give ordinary lessons in a family manner, it is much better in educating a child, but I might take legal action if my child is old enough and commits theft not only once, parents only educate to a certain extent, if a child does not understand the lesson then it needs to be taught by someone else such as being locked up in prison.
Indeed, if it's already in the right age I'll do the same, better to let them understand the hard way, I mean the consequences so they will learn about their mistakes, but if the kids still young and still have that chance to listen, maybe trying to take disciplinary actions that can help them to stay away from this kind of bad habits will do.