To hire a nanny legally in India, you need: (1) the nanny’s Aadhaar card, (2) address proof (current and permanent), (3) police verification certificate, (4) a signed written employment agreement, (5) recent passport-size photographs, and (6) reference letters from previous employers. Additionally, collect the nanny’s bank account details for salary payment records, a health/fitness certificate if hiring for childcare, and consent for the background check. Keep photocopies of all documents in a safe file.