Family Code, Art. 104

Whenever the liquidation of the community properties of two or more marriages contracted by the same person before the effectivity of this Code is carried out simultaneously, the respective capital, fruits and income of each community shall be determined upon such proof as may be considered according to the rules of evidence. In case of doubt as to which community the existing properties belong, the same shall be divided between the different communities in proportion to the capital and duration of each. (189a)