735 ILCS 5/12-137
Any redemption made under Sections 12-132 through 12-136 of this Act, by any judgment creditor, his or her heirs, executors, administrators or assigns after the expiration of 3 months and within 6 months after the original sale, is subject to subsequent redemption within 6 months after the date of the original sale by any defendant, his or her heirs, executors, administrators, assigns, or any person interested in the premises through or under the defendant, in the manner provided in this Section. In the event there is a redemption by any defendant, his or her heirs, executors, administrators, assigns, or any person interested in the premises through or under the defendant, in accordance with Section 12-122 or this Section 12-137, the right to further redemption by any judgment creditor, his or her heirs, executors, administrators or assigns, is terminated, notwithstanding any other provisions of this Act. Any such defendant, his or her heirs, executors, administrators, assigns, or any person interested in the premises through or under the defendant, having a right to redeem, may redeem by paying to the sheriff or other proper officer the amount at which the premises were last redeemed by the judgment creditor, his or her heirs, executors, administrators or assigns, with interest thereon at the rate of 10% per annum, from the date of the last redemption; however, if the premises were sold pursuant to such last redemption for an amount greater than the redemption money, interest and costs, then the amount payable shall be the amount for which the premises were sold, together with interest on that amount at the rate of 10% per annum from the time of such sale, and costs of sale.
735 ILCS 5/12-137