Lapsing of the institution of heir by supervenience of the children to the testator

Where there are children or other descendants of the testator, whom he did not know or thought dead, or where children are born to the testator after his death, or even before his death but after the Will has been made, the Will shall be valid only in relation to the disposable portion and to the legacies, in accordance with paragraphs 1 and 2 of article 1814.