Should I send any documents if I open my account online?
No, you needn't send any documents if you open an account online.
If you wish to nominate your family member to your demat account, you will need to print out, fill & sign the nomination form and send the form to the Zerodha Head Office:
#153/154 4th Cross Dollars Colony,
Opp. Clarence Public School,
J.P Nagar 4th Phase, Bangalore - 560078