Attitudes about caste - Pew Research Center (2021) - A survey chapter on how Indians of every religion identify with caste categories, how they see discrimination, and how strongly many want marriages to stay within caste. A good source of real numbers.
Religion in India: Tolerance and Segregation - Pew Research Center (2021) - The overview of the nearly 30,000-person survey behind the caste figures, with context on religion and family life in India.
How Indians View Gender Roles in Families and Society - Pew Research Center (2022) - Survey results on who should earn money, care for children and make decisions at home. Useful for the "Gender Roles and Change" section.
Religion and household makeup around the world - Pew Research Center (2019) - Compares household types and sizes around the world, including large extended-family households in Afghanistan and Pakistan.
Article 17: Abolition of Untouchability - Constitution of India (constitutionofindia.net) - The text of the article that abolished untouchability. Read it alongside Article 15 on the same site.
Universal Declaration of Human Rights - United Nations - Article 16 says marriage requires the free and full consent of both people, which is the line that separates arranged from forced marriage.
Sikhism: Weddings - BBC Religions (archived) - A clear step-by-step description of the Anand Karaj, including the four laavan and the Anand Marriage Act of 1909.
Islam: Weddings - BBC Religions (archived) - Explains the nikah, the mahr and why the couple's consent is required in Islamic marriage.
Suggested Explanations of Sheepa (Sherpa) Names - The Himalayan Journal, vol. 20 (1957) - An older journal note listing the Sherpa names tied to each day of the week, such as Nyima (Sunday) and Dawa (Monday).
Kinship terminology - Wikipedia - A starting point for comparing how languages sort relatives, including the Dravidian system used in Tamil and Sinhala. Follow its citations to anthropology sources.