B-1, r. 3.1 - Code of Professional Conduct of Lawyers
84. Before acting for more than one client in a joint mandate, the lawyer must obtain their consent after having informed them that:
(1) he will act for more than one client in the same matter;
(2) no information received from one client regarding the matter will be confidential with respect to the other client; and
(3) if a dispute arises between them, he may have to cease acting for them in the matter.