Where a person either by himself or, if he has a family, or is a member of a joint family, together with any other member of the family, or joint family, holds land not exceeding the ceiling limit referred to in section 63 or 64, but subsequently the land held exceeds the ceiling limit, due to any change in the classification of the land consequent upon any improvements effected in the land by such person or of the family or due to a decrease in the number of members of the family, then, notwithstanding anything contained in this Chapter, such person shall not be required to surrender any part of the land on the ground that it is excess land.