Idaho Rules of Civil Procedure Rule 21. Misjoinder and Nonjoinder of Parties.
Misjoinder of parties is not a ground for dismissing an action. On motion or on its own, the court may at any time, on just terms, add or drop a party. The court may also sever any claim against a party.
(Adopted March 1, 2016, effective July 1, 2016 [1].)
Links
[1] https://isc.idaho.gov/rules/IRCP/03012016-Adoption-Newly-Formatted.pdf