Missouri Revised Statutes Title X. Taxation and Revenue § 141.470. Infants, disabled persons or convicts actions to foreclose, procedure

1. If any infant, disabled person or convict in actual confinement shall file an answer, or if the disability of such person shall be called to the attention of the court, the court shall cause a copy of the letter notice of foreclosure described in section 141.450 to be forwarded by United States registered mail to the conservator of the disabled person or trustee of the convict, or if the disabled person has no conservator or the convict has no trustee the court shall appoint a guardian ad litem for the disabled person or convict to represent him in the suit.

2. Failure to appoint or notify a guardian, conservator, or trustee, or to appoint a guardian ad litem as herein provided, after the disability is called to the attention of the court, shall constitute error that may be reviewed on appeal but absent such appeal this shall not invalidate any judgment rendered under sections 141.210 to 141.810. The error may also be urged by any competent person who may take an appeal on behalf of the disabled person or convict.