Stamp duty on transfer

My sisters and I inherited a flat in a cooperative society in Mumbai, from our deceased parents. I would like to transfer my rights in the property, for no consideration in favour of my siblings. The property is located in Mumbai. Qs1: What would be the pros and cons if I did relinquishment deed, versus if I gift deed? Qs1: Would any of us have to pay stamp duty at the time of relinquishing my rights or gifting my share to my remaining siblings? Qs2: If I relinquish or gift my shares, then would I have to do it equally among my remaining siblings who have a right in the property, or can I release my rights/gift my share to just any one of my siblings? Thank you in advance.