California Code, Family Code - FAM § 803

(a) If acquired by the married woman, the presumption is that the property is the married woman's separate property.

(b) If acquired by the married woman and any other person, the presumption is that the married woman takes the part acquired by her as tenant in common, unless a different intention is expressed in the instrument.

(c) If acquired by husband and wife by an instrument in which they are described as husband and wife, the presumption is that the property is the community property of the husband and wife, unless a different intention is expressed in the instrument.