“Plaintiff must join as parties to the action all persons whose interests are so directly involved that the court cannot render a fair adjudication in their absence. Plaintiff is required to join as parties to the action any person whose interest is such that: In the person’s absence, complete relief cannot be accorded among those already parties to the action; or Any judgment rendered in the person’s absence might either (a) prejudice the person’s ability to protect his or her interest in later litigation; or (b) leave any of the parties before the court exposed to a risk of additional liability or inconsistent obligations.”
[California Practice Guide: Civil Procedure Before Trial [certain citations omitted]]
