Ohio Rev. Code Ann. § 3109.04
(A) In any divorce, legal separation, or annulment proceeding and in any proceeding pertaining to the allocation of parental rights and responsibilities for the care of a child, upon hearing the testimony of either or both parents and considering any mediation report filed pursuant to section 3109.052 of the Revised Code and in accordance with sections 3127.01 to 3127.53 of the Revised Code, the court shall allocate the parental rights and responsibilities for the care of the minor children of the marriage. Subject to division (D)(2) of this section, the court may allocate the parental rights and responsibilities for the care of the children in either of the following ways:
(B)
(2) If the court interviews any child pursuant to division (B)(1) of this section, all of the following apply:
(D)
(1)
(a) Upon the filing of a pleading or motion by either parent or both parents, in accordance with division (G) of this section, requesting shared parenting and the filing of a shared parenting plan in accordance with that division, the court shall comply with division (D)(1)(a)(i), (ii), or (iii) of this section, whichever is applicable:
(E)
(1)
(a) The court shall not modify a prior decree allocating parental rights and responsibilities for the care of children unless it finds, based on facts that have arisen since the prior decree or that were unknown to the court at the time of the prior decree, that a change has occurred in the circumstances of the child, the child's residential parent, or either of the parents subject to a shared parenting decree, and that the modification is necessary to serve the best interest of the child. In applying these standards, the court shall retain the residential parent designated by the prior decree or the prior shared parenting decree, unless a modification is in the best interest of the child and one of the following applies:
(2) In addition to a modification authorized under division (E)(1) of this section:
(F)
(1) In determining the best interest of a child pursuant to this section, whether on an original decree allocating parental rights and responsibilities for the care of children or a modification of a decree allocating those rights and responsibilities, the court shall consider all relevant factors, including, but not limited to:
(2) In determining whether shared parenting is in the best interest of the children, the court shall consider all relevant factors, including, but not limited to, the factors enumerated in division (F)(1) of this section, the factors enumerated in section 3119.23 of the Revised Code, and all of the following factors:
(I)
(J) As used in this section:
(L) For purposes of the Revised Code: