1) cancellation of settlement deed can only be with consent of parties
2) unilateral cancellation of settlement deed is not possible
3) you will have to file suit to set aside gift deed
4) the issue as to whether an unilateral cancellation of an instrument is valid or not was dealt with by a single judge of this Court in the case of (D.V.Loganathan Vs Sub-Registrar, Office of the sub-Registrar, Chennai-44) reported in (2014) 3 MLJ 666 wherein in paragraph Nos. 5 to 7 it was held as follows:
5. At the outset the learned counsel appearing for the petitioner would submit that the unilateral cancellation of the settlement deeds without notice to the petitioner by the first respondent Sub-Registrar is contrary to the provisions of the Transfer of Property Act and also the Judgment rendered by this Court in W.P.No.17983 of 2011 on 01.03.2012, wherein this Court held that when a deed is irrevocable, unilaterally cancelling the said deed without notice to the parties concerned is contrary to law and cannot be sustained.
6. In fact the registration of cancellation of the settlement deed is against the public policy as it was not open to the Sub-Registrar to register the cancellation of the deed, when the settlement deed is unconditional and irrevocable. If at all the party who has executed the document is aggrieved by the settlement deed, he could have very well approached the Civil Court to set it aside, but certainly could not unilaterally cancel it, by getting the deed of cancellation registered with the Sub-Registrar. The cancellation deed and its registration therefore being without jurisdiction is liable to be set aside