New York Consolidated Laws, Real Property Actions and Proceedings Law - RPA § 905. Complaint

The complaint shall describe the property with reasonable certainty, specify the rights, shares and interests therein of each of the parties, as far as the same are known to the plaintiff, and contain any other allegation required by statute.  If a party, or the share, right or interest of a party, be unknown to the plaintiff;  or if a share, right or interest be uncertain or contingent;  or if the ownership of the inheritance depend upon an executory devise;  or if a remainder be contingent, so that the party cannot be named;  such facts shall be stated in the complaint.  The complaint shall state whether the parties own any other lands in common.