Código Civil y Comercial: Artículos 2433-2436 (Sucesión del cónyuge)
If the descendants inherit, the spouse shares in the hereditary estate in the same proportion as sons and/or daughters. If the ascendants inherit, half of the inheritance corresponds to the spouse. In the absence of descendants and ascendants, the spouse inherits the entirety of the estate. The spouse does not inherit if the deceased dies within 30 days of the marriage due to an illness, which existed at the time of marriage and was known by the survivor to have a foreseeable fatal outcome, unless, the marriage was preceded by a union in joint habitation.