Okla. Stat. tit. 67, § 67-45: Opposition to petition

Any person interested may oppose any such petition, and file his

demurrer or answer thereto on or before the third day of the term of

court named in said publication notice, unless the time be extended

by order of court, and may also file a cross petition if he or she

desires to do so. Said answer shall admit, confess and avoid, or

deny all the material allegations of the petition, and shall, except

when made by guardian ad litem, be verified by the affidavit either

of the respondent or his agent, in the same manner as above required

in cases of the petition. Said answer shall have no other or

greater weight as evidence than the petition.