Hello,
- The property has not lost its character as ancestral property. You can sign as a co parcener or your Affidavit of NOC for the sale can be attached to give your consent for the sale along with other coparceners if any other.
- You can't get exemption and therefore insist on having mother as the only signatory with you providing an NOC.
- Get the cheque for 100% consideration in mother's name and provide NOC or sign as they suggest.