25 CFR §213.12

Leases executed by guardians of minors under order of court for a period extending beyond the minority of the minor will be approved unless it appears that such action would be prejudicial to the interests of the minor: Provided, That in the event the minor becomes of age within 1 year from the date of execution of lease the consent of the minor to the execution of the lease should be obtained and submitted with the lease for consideration.