With either entity theory or aggregate theory,

Hypo: You are approached by Basil, Sybil, and Gowan to help form a business. Who do you represent?

Assume you had represented Basil in his divorce. You know that he is strapped for cash, given his spousal maintenance obligations. If the parties tell you that they expect that Basil will run the new business, and make decisions about whether to reinvest or pay out earnings, should you (can you) tell the others about Basil's personal financial situation?