18(1)The mentally incompetent person, his heirs, executors, next of kin, devisees, legatees and assigns, shall have the same interest in any money arising from any sale, mortgage or other disposition under the powers of this Act, that may not have been applied under such powers, as he or they would have had in the property the subject of the sale, mortgage, or disposition, if no sale, mortgage or disposition had been made, and the surplus money shall be of the same nature as the property sold, mortgaged or disposed of.