A settlor may be represented by a representative in amending, terminating, or revoking an inter vivos revocable trust only when the representative is:
In other respects, a settlor may be represented by a representative only pursuant to subdivisions 55-18-9(5), (11), (16), and (17) and pursuant to subdivision 55-18-9(1) to the extent authorized or approved by the court.
A settlor may not bind a beneficiary with respect to a trust termination pursuant to § 55-3-24 or 55-3-30 or a trust modification pursuant to § 55-3-24 or 55-3-30 where the ability to bind the beneficiary to the proposed trust modification would constitute a retained interest pursuant to 26 U.S.C. § 2036, as of January 1, 2017, or a revocable transfer pursuant to 26 U.S.C. § 2038 as of January 1, 2017.
SDCL 55-18-20