[Grisgra]

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Still living at home? Then only go to the casino rarely, if at all. She's not going to be convinced, hiding it is unpleasant (and perhaps impossible), and everyone will get along better if you do as she asks -- this is ultimately worth more than the occasional good time at the casino.

If you're not living at home, then go as often as you like, and lie about it. She doesn't have a right to know about every single thing you do, and feeding her irrational fears won't do anyone any good.

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This is the correct answer.

It sounds like the OP's dad is cool, so don't worry about him. He's not going to change his mom though, so the best thing he can do is just not tell her. Its only going to make things worse to try and change her mind.

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I concur. Trying to change her mind about this is next to hopeless, especially given the experience she went through with her dad. Just go & lie about it, or wait until you move out of the house. Just going to have to humor her.