Okla. Stat. tit. 58, § 58-1003: Joint tenants or tenants by the entirety

Where there is no sufficient evidence to establish that the two

joint tenants or tenants by the entirety have died otherwise than

simultaneously, the property so held shall be distributed one-half

(1/2) as if one had survived and one-half (1/2) as if the other had

survived. If there are more than two joint tenants and all of them

have so died the property thus distributed shall be in the

proportion that one bears to the whole number of joint tenants. The

term "joint tenants" includes owners of property held under

circumstances which entitled one or more to the whole of the

property on the death of the other or others.