Rules of Prof. Conduct, Rule 1.14
Rule 1.14 Client under a
Disability
(a) When a client's ability to make adequately considered decisions in
connection with the representation is impaired, whether because of minority,
mental disability or for some other reason, the lawyer shall, as far as
reasonably possible, maintain a normal client-lawyer relationship with the
client.
(b) A lawyer may seek the appointment of a guardian or take other
protective action with respect to a client, only when the lawyer reasonably
believes that the client cannot adequately act in the client's own interest.