As per section 15 of Hindu Adoption and Maintenance Act, 1956 ; a valid adoption not to be cancelled.
The extract of above said provision is reproduced as under:
15. Valid adoption not to be cancelled- No adoption which had been validly made can be cancelled by the adoptive father or mother or any other person, nor can the adopted child renounce his or her status as such and return to the family of his or her birth.
However , Civil Court has power to declare adoption deed as invalid and inoperative in case if it was made in conflicting with any of existing provisions for valid adoption.
Therefore, Civil Court having territorial jurisdiction of place at which such adoption deed was made would be eligible to e terrain such civil suit.