Okla. Stat. tit. 30, § 30-3-103: Nomination of guardian or limited guardian by will

A parent of an unmarried incapacitated or partially

incapacitated person, the spouse of a married incapacitated or

partially incapacitated person, or an adult child of such person who

is serving as guardian or limited guardian may nominate by will, or

by other writing executed by the nominating parent or parents,

spouse, or adult child, an individual to serve as guardian or

limited guardian upon the death or incapacity of the nominator.

Such nomination shall be executed by the nominator in the same

manner as provided for nominations made pursuant to Section 3-102 of

this title.