643.4  New parties.
  If a third person claims the property or any part thereof, the plaintiff may amend and bring the third person in as a codefendant, or the defendant may obtain the substitution by the proper mode, or the claimant may intervene by the process of intervention.
[C51, §1684, 1999; R60, §3561; C73, §3228; C97, §4166; C24, 27, 31, 35, 39, §12180; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §643.4]
Interpleader, 
R.C.P. 1.251 – 1.257
Intervention, 
R.C.P. 1.407