Doctrine of feeding the grant by estoppel
The estoppel rests on the representation(express or implied) made by the transferor that he is authorized to transfer, which representation subsequently turns out to be erroneous. It makes no difference that the transferor had no interest whatsoever in the property or the interest therein that of an expectant heir. Further, it is immaterial whether the transferor acts bona fide or fraudulently in making the representation. What is material is that he did make a representation and the transferee acted on it and thus has been misled. In other words the doctrine applies only when the transferee has been misled into believing a false representation and not otherwise. The doctrine also applies in cases where the transferor has a duty to speak and he fails to do so. Where a person sold the property as an agent of the widow, and later became her heir, the doctrine did not apply, as there was no erroneous representation.