S.D. Codified Laws § 21-45-10
In all partition proceedings including sales conducted before July 1, 1947 in the circuit courts of this state, in which any duly appointed, qualified and acting personal representative shall have appeared as a party plaintiff, or defendant, and the heirs or devisees therein were not named as parties or served with process, the appearance of such personal representative in his official capacity shall be deemed to have been an appearance on behalf of all the heirs or devisees, and where such proceedings including sales shall have been duly confirmed, the same is hereby legalized, cured and validated and the authority of such personal representative to appear as a party plaintiff or defendant on behalf of the heirs or devisees is hereby confirmed.
SDCL 21-45-10