Título V. Testigos
Article 51
The Notary may associate with instrumental witnesses in the acts or contracts he authorizes. But if it involves wills or donations by reason of death, he is obligated to associate with the witnesses required by this law.
Article 52
Witnesses must be civilly capable, suitable and known to the Notary. If the Notary did not know them beforehand, the Notary shall ascertain their identity by legal means.
Article 53
The following may not be witnesses:
1ºPersons who do not know how to read and write or who do not speak or do not understand Spanish;
2ºPersons who have a manifest interest in the act or contract;
3ºDeaf, mute or blind persons;
4ºRelatives of the Notary; and
5ºRelatives of the grantors, except where they sign at their request, when they do not know how to do so and it does not involve wills or donations by reason of death.
Source: CENADOJ, Organismo Judicial. Texto al 30 de abril de 2014. Machine-translated from the official Spanish text; Códice is not legal advice, always verify against the official publication.