S.D. Codified Laws § 25-7-27
Any adult child, having the financial ability to do so, shall provide necessary food, clothing, shelter, or medical attendance for a parent who is unable to provide for oneself. However, no claim may be made against such adult child until the adult child is given written notice that the child's parent is unable to provide for oneself, and such adult child has refused to provide for the child's parent. Notice required by this section shall be given within ninety days after the necessary food, clothing, shelter, or medical attendance, claimed in the notice, was first provided for the parent. However, in the case of fraud or misrepresentation, notice shall be provided within ninety days after such fraud or misrepresentation is known or should have been known. If the parent or someone acting on behalf of the parent makes application for assistance pursuant to chapter 28-13, the county shall give the written notice required herein within ninety days after it receives the application or notice required under § 28-13-1, 28-13-32.3, 28-13-32.4, or 28-13-34.1, whichever is sooner.
SDCL 25-7-27