He came from the highest Hindu caste.

他出身印度最高的种姓。

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These are the Dhobis, a Hindu caste, born into the job of doing laundry.

NPR: Mumbai's Dhobi Toil With Laundry

The Chowdulis are Muslim, and therefore outside of the traditional Hindu caste system.

WSJ: India Classifies More Castes as 'Backward' In Affirmative-Action Bid to Help the Poor

Their lives continue to be influenced by the ancient Hindu caste system, which assigns each person a place in the social hierarchy.

BBC: India profile