Where real estate in this state might be claimed to have escheated to the state by reason of the heirs at law of a citizen of the United States, who died intestate owning such land, being aliens and incapable of inheriting, which land has heretofore been conveyed by such alien heir or heirs, to a citizen of the United States for a valuable consideration, and has been occupied in reliance upon said conveyance, without an adverse claim or title or right thereto having been asserted by the state for more than twenty-five years subsequent to such conveyance, the title and possession of such grantee, or his or her heirs or assigns, shall never be questioned in any manner, by or on behalf of the state of Kansas, and the state shall be deemed to have forever forfeited all title or right it may have ever had thereto.