Article 1540 of the French Civil Code
When one of the spouses takes over the management of the other’s property, with the latter’s knowledge, and nevertheless without opposition on his part, he is deemed to have received a tacit mandate, covering acts of administration and management, but not acts of disposal. This spouse is answerable to the other for his management as a mandatary. He is, however, only accountable for existing fruits; for those he may have…