Grandparent & Non-Parent Custody in Mercer County, Ohio

Reviewed by Stephanie Green · Managing Partner & Co-Founder · Last updated June 11, 2026

Mercer County, Ohio · Celina · Probate/Juvenile Division

When a grandparent or relative is raising a child, Mercer County offers a few tools depending on how much authority is needed. Quick delegations handle school and medical needs; formal legal custody to a non-parent is decided by the Juvenile Court (Suite 307).

How can a grandparent or relative get custody in Mercer County, Ohio?

For quick authority over school and medical needs, use a Grandparent Power of Attorney (R.C. 3109.52) or, when a parent is unavailable to sign, a Caretaker Authorization Affidavit (R.C. 3109.65) — both forms come from the Juvenile Court. These are not custody orders and a parent can revoke a POA. For lasting authority, a relative or other suitable adult can file for legal custody in the Juvenile Court (R.C. 2151.23, 2151.353): file a complaint with supporting affidavits, a Parenting Proceeding Affidavit, and the $200 deposit; service is required. The court applies a best-interest analysis and, where the child is not abused/neglected/dependent, considers parental suitability. A GAL may be appointed ($1,000 deposit).

Ohio Custody by the Numbers

Best interest The single standard that governs every Ohio custody decision Source: Ohio Revised Code § 3109.04
No set age There is no age a child can choose a parent — the judge weighs a mature child's wishes Source: Ohio Revised Code § 3109.04(B)
Change in circumstances Required, plus a best-interest finding, before the residential parent can be changed Source: Ohio Revised Code § 3109.04(E)(1)
Shared parenting Either parent may ask the court for a joint parenting plan Source: Ohio Revised Code § 3109.04(G)

Compare Types of Custody in Ohio

Custody type	Who makes major decisions	Where the child lives	Best when
Shared parenting	Both parents jointly, under a written plan	Time is split per the plan (not always 50/50)	Parents can communicate and cooperate on decisions
Sole legal & residential	One parent	Primarily with that parent	One parent is unable or unwilling to co-parent
Split custody	Each parent for the child in their care	Siblings are divided between the two homes	Rare — only when it serves each child's best interest
Legal custody to a non-parent	The relative or caregiver granted custody	With the non-parent caregiver	Neither parent can safely care for the child

Where to File: Mercer County Court of Common Pleas — General Division (Clerk of Courts, Legal Division)

101 N Main St, Room 205, PO Box 28, Celina, OH 45822
Phone: (419) 586-6461
Hours: Monday 8:30 AM–5:00 PM; Tuesday–Friday 8:30 AM–4:00 PM
Website: www.mercercountyoh.gov/elected-officials/clerk-of-courts/

Juvenile Branch (Never-Married Parents)

Mercer County Court of Common Pleas — Probate/Juvenile Division
101 N Main St, Suite 307, Celina, OH 45822
Phone: (419) 586-1249
Hours: Monday 8:30 AM–5:00 PM; Tuesday–Friday 8:30 AM–4:00 PM

Grandparent & Non-Parent Custody is the right path if…

This is the right path in Mercer County if…

You're a grandparent or relative raising a child and need legal authority for their care.
You need quick school/medical authority (POA or Caretaker Affidavit) or lasting authority (legal custody).
You're willing to file in the Juvenile Court (Suite 307) for formal legal custody.
You can show that non-parent custody serves the child's best interest.
You understand a POA can be revoked by a parent, while legal custody is a court order.

Filing Fees

Grandparent POA / Caretaker Authorization Affidavit: forms from the Juvenile Court (confirm any recording cost) · Legal custody to a non-parent: $200 deposit + $25 stenographer's fee · GAL deposit $1,000 if appointed. Confirm amounts with the Juvenile Court at 419-586-1249.

Forms & Filing Packets

Quick authority — POA or Caretaker Affidavit — Recorded/filed with the Juvenile Court (confirm any cost)

Mercer County Juvenile Court Forms — The Probate/Juvenile Division's own forms for never-married parents: Complaint for Parentage / Allocation of Parental Rights (Custody) / Parenting Time, parenting plans, motions to change custody or parenting time, motions for contempt with Show Cause Order, financial and health-insurance affidavits, the IV-D application, and the Grandparent Power of Attorney / Caretaker Authorization Affidavit.

Legal custody to a non-parent (full case) — $200 deposit · GAL $1,000 if appointed

Parenting Proceeding Affidavit (UCCJEA · R.C. 3127.23) — Lists where each child has lived for the last 5 years and with whom, confirming Ohio's jurisdiction over custody under the UCCJEA. Required in any case involving minor children.
Mercer County Juvenile Court Forms — The Probate/Juvenile Division's own forms for never-married parents: Complaint for Parentage / Allocation of Parental Rights (Custody) / Parenting Time, parenting plans, motions to change custody or parenting time, motions for contempt with Show Cause Order, financial and health-insurance affidavits, the IV-D application, and the Grandparent Power of Attorney / Caretaker Authorization Affidavit.
Mercer County Juvenile Division Rules of Court (eff. 2026) — The Juvenile Division's local rules and Appendix A deposit schedule, including custody/parentage filing (Rule 6.04), modification (Rule 6.04(D)), contempt (Rule 6.05), relocation (Rule 6.06), and the Local Rule 7 parenting-time guidelines (Appendix B).

How to File Grandparent & Non-Parent Custody in Mercer County

Choose the right tool. For short-term school and medical authority, use a Grandparent Power of Attorney (R.C. 3109.52) or, when a parent is unavailable to sign, a Caretaker Authorization Affidavit (R.C. 3109.65). For lasting authority, file for legal custody.
Get the forms from the Juvenile Court. The Mercer County Juvenile Court provides the POA and Caretaker Authorization Affidavit forms. These are filed/recorded but are not the same as a custody order.
File for legal custody if needed. A relative or suitable adult files a complaint/motion in the Juvenile Court (Suite 307) with supporting affidavits, a Parenting Proceeding Affidavit, and the $200 deposit. Service on the parents is required.
Attend the best-interest hearing. The court applies a best-interest analysis and, where the child is not abused/neglected/dependent, considers parental suitability. A GAL ($1,000 deposit) may be appointed to investigate and recommend.

Mercer County Practice Notes

POA and Caretaker Affidavit are not custody orders. A Grandparent Power of Attorney (R.C. 3109.52) or Caretaker Authorization Affidavit (R.C. 3109.65) grants school and medical authority but is not a custody order — a parent can revoke a POA. For lasting authority, file for legal custody in the Juvenile Court.
Non-parent custody is a Juvenile Court matter. Formal legal custody to a relative or other suitable adult is decided by the Mercer County Juvenile Court (R.C. 2151.23, 2151.353). In abuse/neglect/dependency cases brought by DJFS, the court can place a child in a relative's legal custody as part of the disposition.
Unmarried mother is sole custodian until a court order. Until the Juvenile Court orders otherwise, an unmarried mother is the sole residential parent and legal custodian (R.C. 3109.042). A father establishes his rights by first establishing parentage and then asking the court to allocate parental rights and parenting time.

Frequently Asked Questions

I'm raising my grandchild in Mercer County — what can I do quickly?: For school and medical authority, use a Grandparent Power of Attorney (R.C. 3109.52) or, when a parent is unavailable to sign, a Caretaker Authorization Affidavit (R.C. 3109.65) — both forms are available from the Juvenile Court. These are not the same as a custody order; a parent can revoke a POA. For lasting authority, file for legal custody.
Where do non-parents file for custody in Mercer County?: In the Mercer County Juvenile Court (Suite 307). A relative or other suitable adult can ask for legal custody of a child (R.C. 2151.23, 2151.353); file a complaint with supporting affidavits, a Parenting Proceeding Affidavit, and the $200 deposit. A GAL may be appointed ($1,000 deposit, except in abuse/neglect/dependency cases).
We were never married — where do I file for custody in Mercer County?: In the combined Probate/Juvenile Division (Judge Matthew L. Gilmore) on the 3rd floor, Suite 307, 419-586-1249. Parentage, custody, parenting time, and support for never-married parents are Juvenile Court matters, not divorce-court matters.
When does Mercer County appoint a Guardian ad Litem, and what does it cost?: In a contested custody or parenting-time case, either court can appoint a GAL to investigate and recommend what is in the child's best interest. The GAL deposit is $1,000 in both courts (no deposit in Juvenile abuse/neglect/dependency or delinquency cases). A court-appointed Juvenile GAL may bill no more than $100/hour. GAL fees are typically allocated between the parties.

Free Local Resources in Mercer County

Mercer County Clerk of Courts — Legal Division (divorce, dissolution, legal separation, annulment, CPO). Clerk Calvin Freeman, 101 N. Main St., Room 205, PO Box 28, Celina, OH 45822; (419) 586-6461; fax (419) 586-5826; clerk@mercercountycourts.com. Files all Domestic Relations and civil cases and confirms current deposits (divorce, dissolution, and post-decree motions are each a $350 deposit eff. 4/1/2024). No personal checks — cash, money order, or cashier's check, or pay online via LexisNexis. Court staff cannot give legal advice. Confirm the current amount and any e-filing registration (Common Pleas Loc.R. 29) with the Clerk before filing.
Mercer County Court of Common Pleas — General Division (hears all Domestic Relations cases). Judge Matthew K. Fox, Magistrate Richard M. Delzeith, 101 N. Main St., Room 301, Celina, OH 45822; (419) 586-2122; cpc@mercercountycourts.com. Decides divorce, dissolution, legal separation, annulment, DR post-decree, and domestic-violence civil protection orders. There is no separate Domestic Relations court.
Mercer County Probate/Juvenile Division (never-married parents, non-parent custody). Judge Matthew L. Gilmore, Suite 307 (3rd floor), 101 N. Main St., Celina, OH 45822; juvenile line (419) 586-1249 or (419) 586-2418; fax (419) 586-4506; https://mercercountycourts.com/index.php. Handles parentage, custody, parenting time, and support for never-married parents, plus grandparent and other non-parent custody. New custody/support/visitation/paternity cases carry a $200 deposit (plus a $25 stenographer's fee); confirm current amounts with the court.
Mercer County Child Support Enforcement Agency (CSEA). 220 W. Livingston St., Room B181, PO Box 649, Celina, OH 45822-0649; (419) 586-7961; toll-free 800-207-3597; fax (419) 586-2151; hours M–F 8:30 AM–4:00 PM. Opens IV-D child-support cases, establishes paternity administratively, runs wage withholding, distributes payments, and enforces orders.
A-OK Parenting Program (required for divorce/dissolution with minor children). Mercer County requires each parent in a divorce or dissolution with minor children to attend the A-OK Parenting Program before the final hearing (Common Pleas Loc.R. 21.02). Cost is a one-time $30 per person, paid at the class; you are registered automatically when you file, and the court mails your assigned date. The program runs 6:00–9:00 PM on the 4th Tuesday of January, March, May, July, September, and November in Room 303 of the courthouse. Juvenile (never-married) cases are generally not ordered into A-OK. Call (419) 586-2122 to reschedule.
Ohio Legal Help & legal aid. Ohio Legal Help (https://www.ohiolegalhelp.org/) has plain-English guides and the Ohio Supreme Court standardized forms for divorce, custody, support, and protection orders. Legal Aid of Western Ohio (LAWO) serves Mercer County for income-eligible residents — confirm the current intake line.

Related to your non-parent custody case

Paternity & Custody — Establish parentage and build a parenting plan that protects your children.
Adoption — Grow your family through step-parent, agency, or kinship adoption.
Child Support — Calculate, establish, or modify support under Ohio's guidelines.

Related guides

In-depth, attorney-written guides on non-parent custody and related Ohio family law topics.

Grandparents' Rights in Ohio: Visitation and Custody — Ohio grandparents can sometimes seek court-ordered companionship time or even custody — but only in specific circumstances and always under the best-interest standard. Here's how it works.
Ohio Child Custody Laws: What Every Parent Should Know — Ohio custody law turns on one principle: the best interest of the child. This guide explains sole custody, shared parenting, the statutory factors, and how courts decide.
Kinship Adoption in Ohio: Adopting a Relative's Child — When a child can't safely stay with their parents, relatives often step in. Kinship adoption gives that arrangement legal permanence. Here's how it works in Ohio — and how it differs from custody.

Keep exploring

Ohio Grandparent / Non-Parent Custody guide — Statewide overview of grandparent / non-parent custody in Ohio.
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