Minn. Stat. § 281.04: REDEMPTION BY PERSONS UNDER DISABILITY.

Minors, persons with a mental illness, persons with a developmental disability, or persons in captivity or in any country with which the United States is at war, having an estate in or lien on lands sold for taxes, of record in the office of the county recorder of the county where the lands lie, before the expiration of three years from the date of such sale, may redeem the same within one year after such disability shall cease; but in such case the right to redeem must be established in a suit for that purpose brought against the party holding the title under the sale.