A conjoint or mutual will is valid, but it may be revoked by any of the testators in like manner with any other will.
Okla. Stat. tit. 84, § 52
Mutual will - Revocation
R.L.1910, § 8345.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.