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You're not the only one - at our house we still have all the aunts at Diwali with a deck of cards, and no one even thinks about where this tradition came from. I once wondered about it and found this article: https://khelnow.com/tips/ancient-hindu-gambling-rituals-india. It describes in detail how gambling was woven into religious and social rituals. It was especially interesting to learn that even women actively participated in such games and it was considered the norm. It's cool when habits from the past flow so seamlessly into family traditions - even if you don't always realize their roots.