Section 101 Of Part 1. Effect Of Death Of Married Person On Community And Quasi-community Property From California Probate Code >> Division 2. >> Part 1.

. (a) Upon the death of a married person domiciled in this state, one-half of the decedent's quasi-community property belongs to the surviving spouse and the other half belongs to the decedent.
  (b) Notwithstanding subdivision (a), a husband and wife may agree in writing to divide their quasi-community property on the basis of a non pro rata division of the aggregate value of the quasi-community property, or on the basis of a division of each individual item or asset of quasi-community property, or partly on each basis. Nothing in this subdivision shall be construed to require this written agreement in order to permit or recognize a non pro rata division of quasi-community property.