B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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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.
O.C. 129-2015, s. 84.