have any knowledge of its contents, nor that they shall see the testator
sign it. It is sufficient if the signature is adopted or acknowledged in
their presence. If a will is made with the intention of disposing of
real property it must be executed according to the requirements of the
laws of the state where the real property is situated.

[Sidenote: Interest of witness.]

No subscribing witness to any will can derive any benefit therefrom,
unless there be two disinterested and competent witnesses to the same.
[§3527.] But if, without a will, he would be entitled to any portion of
the testator's estate, he may still receive such portion to the extent
in value of the amount devised. [§3528.]

[Sidenote: Revocation.]

Wills can be revoked in whole or in part, only by being canceled or
destroyed by the act or direction of the testator with the intention of
so revoking them, or by the execution of subsequent wills. [§3529.] The
birth of a child after the execution of a will but before the death of
the testator, operates as a revocation of the will, and the birth and
recognition of an illegitimate child has the same effect. Declarations
of the testator to the effect that he intended to revoke the will, will
not be sufficient to prove a cancellation.

[Sidenote: Cancellation.]

When done by cancellation, the revocation must be witnessed in the same
manner as the making of a new will. [§3530.]