If only one legitimate child or descendant of the deceased survives, the widow or widower shall be entitled to one-fourth of the hereditary estate. In case of a legal separation, the surviving spouse may inherit if it was the deceased who had given cause for the same.
If there are two or more legitimate children or descendants, the surviving spouse shall be entitled to a portion equal to the legitime of each of the legitimate children or descendants.
In both cases, the legitime of the surviving spouse shall be taken from the portion that can be freely disposed of by the testator. (834a)