Okla. Stat. tit. 60 § 74
A joint interest is one owned by several persons in either real or personal property in equal shares, being a joint title created by a single instrument, will or transfer when expressly declared in the instrument, will or transfer to be a joint tenancy, or as between husband and wife a tenancy by entirety or joint tenancy as the grantor may elect, or when granting or devising to executors or trustees as joint tenants. A tenancy by entirety can only be created between husband and wife.
Such joint tenancy or tenancy by entirety may be created by transfer to persons as joint tenants or tenants by entirety from an owner or a joint owner to himself and one or more persons, or from tenants in common to themselves, or by coparceners in voluntary partition, and such estates may be created by or for persons who have elected to become bound under any community property act now in existence or which may hereafter be enacted. An adjudication of incompetency shall not operate to terminate such an estate.
Where a deed, transfer or conveyance grants an estate in joint tenancy or tenancy by entirety in the granting clause thereof, the granting clause shall control over the habendum clause containing language inconsistent to the granting clause.
In the event of the death of a joint tenant or tenant by entirety, leaving estate subject to probate, a certified copy of letters testamentary or of administration shall constitute prima facie evidence of such death.
The provisions of this act shall apply to all estates in joint tenancy or tenancy by entirety in either real or personal property heretofore or hereafter created.
Nothing herein contained shall prevent execution, levy and sale of the interest of the judgment debtor in such estates and such sale shall constitute a severance.
Okla. Stat. tit. 60, § 74