(i) Subsequent transferee who has acquired by transfer or by limitation entire estate of the whole joint family in the property alienated.
(ii) The reversionary heir to the estate of a non-alienating coparcener is also entitled to impeach an alienation made by another coparcener.
(iii) A prior mortgage of joint family property from a single coparcener is not entitled to impeach subsequent sale of the property.
(iv) The alienor himself cannot challenge his own alienation.
A coparcener cannot make a gift even of his own share. Therefore, upon the objection of the other coparcener the gift will be set aside in its entirety.
But in the case of a gift made by the father of ancestral movable property within reasonable limits through affection cannot be set aside. Similarly, a gift of immovable ancestral property by the father within reasonable limit for the pious purposes is valid.
In the States of Bombay and Madras where a coparcener alienates the family property by sale or mortgage in excess of his own share, the alienation will set aside only to the extent of the excess if his own personal share. The other coparcener is entitled to set aside to the extent of their own interest therein.
In the State of Uttar Pradesh and Bengal, if the sale or mortgage by one coparcener is neither for the legal necessity nor for the payment of an antecedent debt the other coparceners are entitled to a declaration that the alienation is void in its entirety
It has been held by the Allahabad and Patna High Courts that the alienation can be impeached only by a coparcener other than the alienating coparcener.