Rule 13. Counterclaim and Crossclaim

. . .

(g) Crossclaim Against a Coparty.  A pleading may state as a crossclaim any claim by one party against a coparty if the claim arises out of the transaction or
occurrence that is the subject matter of the original action or of a counterclaim, or if the claim relates to any property that is the subject matter of the original
action. The crossclaim may include a claim that the coparty is or may be liable to the crossclaimant for all or part of a claim asserted in the action against the
crossclaimant.

(h) Joining Additional Parties.  Rules 19 and 20 govern the addition of a person as a party to a counterclaim or crossclaim.

Rule 14. Third-Party Practice

(a) When a Defending Party May Bring in a Third Party.
    (1) Timing of the Summons and Complaint.  A defending party may, as third-party plaintiff, serve a summons and complaint on a nonparty
    who is or may be liable to it for all or part of the claim against it. But the third-party plaintiff must, by motion, obtain the court’s leave if it
    files the third-party complaint more than 14 days after serving its original answer.
    (2) Third-Party Defendant’s Claims and Defenses.  The person served with the summons and third-party complaint — the “third-party defendant”:
        (A) must assert any defense against the third party plaintiff’s claim under Rule 12;
        (B) must assert any counterclaim against the third-party plaintiff under Rule 13(a), and may assert any counterclaim against the
        third-party plaintiff under Rule 13(b) or any crossclaim against another third-party defendant under Rule 13(g);
        (C) may assert against the plaintiff any defense that the third-party plaintiff has to the plaintiff’s claim; and
        (D) may also assert against the plaintiff any claim arising out of the transaction or occurrence that is the subject matter of the
        plaintiff’s claim against the third-party plaintiff.
    (3) Plaintiff’s Claims Against a Third-Party Defendant.  The plaintiff may assert against the third-party defendant any claim arising out
    of the transaction or occurrence that is the subject matter of the plaintiff’s claim against the third-party plaintiff. The third-party defendant
    must then assert any defense under Rule 12 and any counterclaim under Rule 13(a), and may assert any counterclaim under Rule 13(b) or any
    crossclaim under Rule 13(g).
. . .
   
    (5) Third-Party Defendant’s Claim Against a Nonparty.  A third-party defendant may proceed under this rule against a nonparty who
    is or may be liable to the third-party defendant for all or part of any claim against it.
. . .

(b) When a Plaintiff May Bring in a Third Party.  When a claim is asserted against a plaintiff, the plaintiff may bring in a third party if this rule would
allow a defendant to do so.

Rule 18. Joinder of Claims

(a) In General.  A party asserting a claim, counterclaim, crossclaim, or third-party claim may join, as independent or alternative claims, as many
claims as it has against an opposing party.

Rule 20. Permissive Joinder of Parties

(a) Persons Who May Join or Be Joined.
    (1) Plaintiffs. Persons may join in one action as plaintiffs if:
        (A) they assert any right to relief jointly, severally, or in the alternative with respect to or arising out of the same transaction,
        occurrence, or series of transactions or occurrences; and
        (B) any question of law or fact common to all plaintiffs will arise in the action.
(2) Defendants. Persons . . . may be joined in one action as defendants if:
        (A) any right to relief is asserted against them jointly, severally, or in the alternative with respect to or arising out of the same
        transaction, occurrence, or series of transactions or occurrences; and
        (B) any question of law or fact common to all defendants will arise in the action.