Pennsylvania Code
Title 231 - RULES OF CIVIL PROCEDURE
Part I - GENERAL
Chapter 2220 - JOINDER OF PARTIES
Rule 2229 - Permissive joinder

(a) Persons may join as plaintiffs who assert any right to relief jointly, severally, separately or in the alternative, in respect of or arising out of the same transaction, occurrence, or series of transactions or occurrences if any common question of law or fact affecting the rights to relief of all such persons will arise in the action.

(b) A plaintiff may join as defendants persons against whom the plaintiff asserts any right to relief jointly, severally, separately or in the alternative, in respect of or arising out of the same transaction, occurrence, or series of transactions or occurrences if any common question of law or fact affecting the liabilities of all such persons will arise in the action.

(c) Parties may join or be joined in the alternative although the cause of action asserted by or against any one or more of them is inconsistent with the cause of action asserted by or against any of the others so joined.

(d) A plaintiff who asserts a cause of action ex contractu may join as defendants all or any one or more persons alleged to be liable to the plaintiff on or by reason of the breach of the contractual obligation sued upon, regardless of the capacities in which such persons are respectively liable or whether they are primarily or secondarily liable or whether their liabilities arise from the same or separate acts or undertakings; but where the liability of any defendant is solely joint, the plaintiff shall join all other persons jointly liable with such defendant.

(e) In an action to adjudicate title to or an interest in real or personal property