California Probate Code Section 21402

(a) Shares of beneficiaries abate in the following order: (1) Property not disposed of by the instrument. (2) Residuary gifts. (3) General gifts to persons other than the transferor`s relatives. (4) General gifts to the transferor`s relatives. (5) Specific gifts to persons other than the transferor`s relatives. (6) Specific gifts to the transferor`s relatives. (b) For purposes of this section, a relative of the transferor is a person to whom property would pass from the transferor under Section 6401 or 6402 (intestate succession) if the transferor died intestate and there were no other person having priority.