Ohio Revised Code Title XXXI. Domestic Relations Children § 3111.02

(A) The parent and child relationship between a child and the child's natural mother may be established by proof of her having given birth to the child or pursuant to sections 3111.01 to 3111.18 or 3111.20 to 3111.85 of the Revised Code. The parent and child relationship between a child and the natural father of the child may be established by an acknowledgment of paternity as provided in sections 3111.20 to 3111.35 of the Revised Code, and pursuant to sections 3111.01 to 3111.18 or 3111.38 to 3111.54 of the Revised Code. The parent and child relationship between a child and the adoptive parent of the child may be established by proof of adoption or pursuant to Chapter 3107. of the Revised Code.

(B) A court that is determining a parent and child relationship pursuant to this chapter shall give full faith and credit to a parentage determination made under the laws of this state or another state, regardless of whether the parentage determination was made pursuant to a voluntary acknowledgement of paternity, an administrative procedure, or a court proceeding.