Several contracts relating to the same matters, between the same parties, and made as parts of substantially one transaction, are to be taken together. Ca. Civ. Code § 1642 Enacted 1872.
(a) The following persons may sue without joining as parties the persons for whose benefit the action is prosecuted: (1) A personal representative, as defined in subdivision (a) of Section 58 of the Probate Code. (2) A trustee of an express trust. (3) Except for a person upon whom a power of sale has been conferred pursuant to a deed of trust or mortgage, a person with whom, or in whose name, a contract is made for the benefit of another. (4) Any other person expressly authorized by statute. (b)