Both in relation to his or her spouse and to third parties, a spouse may prove by any means that he or she has exclusive ownership of property.
Presumptions of ownership set out in the marriage contract have effect in relation to third parties as well as in relations between spouses, unless otherwise agreed. Proof to the contrary shall be by right, and shall be by any means capable of establishing that the property does not belong to the spouse whom the presumption designates, or even, if it does belong to him or her, that he or she acquired it by a gift from the other spouse.
Property over which neither spouse can prove exclusive ownership is deemed to belong to them jointly, to each for half.