The main reason for us to realize that "Games at Twilight" is not happening in the USA is the clothes that Ravi's mother wears. This is because the narrative informs that, after bathing, she wears a clean and fresh Sari.
Sari is a traditional outfit worn by women in India, with that, we can confirm that "Games at Twilight" is set in India. This is also confirmed by the names of Ravi's brothers, which are not common names in the US, but are not abnormal in India.
The impactful experience of Ravi's life was a moment when he was forgotten by his brothers, in a joke. This made him extremely sad because he felt rejected and devalued. This experience is not unique to Indian culture and can be felt and lived by any citizen of any culture.