735 ILCS 5/13-109
Except as provided in Section 13-109.1, every person in the actual possession of lands or tenements, under claim and color of title, made in good faith, and who for 7 successive years continues in such possession, and also, during such time, pays all taxes legally assessed on such lands or tenements, shall be held and adjudged to be the legal owner of such lands or tenements, to the extent and according to the purport of his or her paper title. All persons holding under such possession, by purchase, legacy or descent, before such 7 years have expired, and who continue such possession, and continue to pay the taxes as above set forth so as to complete the possession and payment of taxes for the term above set forth, are entitled to the benefit of this Section.
735 ILCS 5/13-109