I would like to know whether an unregistered release deed signed on stamp paper is valid in the court of law. The release deed in reference here was signed by few legal heirs relinquishing all claims on properties owned by other legal heirs. Though every detail including list of properties in reference and payments made to them for releasing their shares were clearly mentioned in the release deed, the signed parties are claiming that it was a temporary arrangement and is not valid anymore. They are claiming their legal share once again for the same list of properties. Please note that the release deed was signed on the government stamp paper but was not registered anywhere.
Any input will help. Thanks.