651.2  Answer.
  The answers of the defendants must state, among other things, the amount and nature of their respective interests. They may deny the interest of any of the plaintiffs, and by supplemental pleading, if necessary, may deny the interest of any of the other defendants.
[C51, §2032; R60, §3610; C73, §3282; C97, §4245; C24, 27, 31, 35, 39, §12318; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §651.2]