For gambling to be running in the family doesn't mean it is the right thing to expose a young child to it, it can impact the lives of the children negatively. First, the family where gambling is common should be investigated first. Is it positive for them or negative? Let's begin from there. I am sure that it can't be positive for them because we all know how gambling is, and if it is working for a few of them, most of them will have bad gambling records.
Even from the nature, gambling is not what a young child should be exposed to, that age is a developmental age that should be started with something productive for better growth in life rather than gambling. Gambling is a latter thing.
I fully support this point of view. Special training or stimulation of children to play gambling is very bad. For me it looks like offering a child high-proof alcohol so that he or she tries it at home, and not somewhere on the street. It is like encouraging unfavorable behavior. But if, for example, parents see that the child is interested in this topic, the child will still find ways to try, and it does not matter whether the parents like it or not. In this case, it is important that such an experience is supervised, it is important to form the right attitude to the game and money in the child. Otherwise, he can make many mistakes, which will then cost him dearly not only financially.