Transfer of shares from Brothers account to my account

My brother who has DMAT account with a DP in NSDL - is going to transfer shares to my account in Zerodha/CSDL. He has the Delivery Instructions Slip from his DP.
1. There is a checkbox for "off-market trades" and a check box for "Inter-depository instructions". I need to check only of them.
2. There is a box with reason code and Reason/Purpose

1. Should my brother be selecting "off-market trades" or "Inter-depository instructions" since shares are being transferred from NSDL to CSDL?
2. What is the reason code/Purpose that he needs to give? this transfer is from one family member to another and the source is NSDL.

Please help.
Thank you.