The witnesses to a public will must have legal capacity.
Civil Code
2015 English source edition · Current applicability not established.
This is the 2015 English-language edition attributed in its front matter to the Ministry of Justice. Eri Atlas has not independently verified the translation, later changes, or whether the text is currently in force. Nine passages are incomplete in the available scan and are identified where they occur.
Article 753
Capacity of Witnesses · Preserved transcription; page attribution imported from the source collection. Verify against the original.
They shall themselves be able to read or to hear what is read and to understand the language in which the will is drawn up.
The will shall be of no effect where such requirements are not fulfilled.