how do i stop a family member from gambling?

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one of my family member who is very old recently discovered the casino. although she has lots of money, i can see now that shes really getting hooked to it and its something that i dont want to happen. sure its fun for awhile but when you go there everyday and lose big amounts of money, its not fun anymore. im just concerned even if she has lots of money, i know some people who were very rich and lost everything because of their addiction to casinos.