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Which part of this excerpt from Jhumpa Lahiri's "Once in a Lifetime" indicates Hema's mother's Bengali heritage?

1{I asked how long you would be staying with us}—a week? Two? 2{My mother couldn't say; it all depended on how long it took your family to get settled} and find a place. 3{The prospect of having to give up my room infuriated me}. My feelings were complicated by the fact that, until rather recently, to my great shame, 4{I'd regularly slept with my parents on the cot in their room, and not in the room where I kept my clothes and things. My mother considered the idea of a child sleeping alone a cruel American practice}, and therefore did not encourage it, even when we had the space.