Form FM-Mod1-100 at a glance
What it is: Form FM-Mod1-100, the Petition to Modify the Parent-Child Relationship, is the form to ask the Court to change the current order about the child(ren). If you are still going through the divorce itself, our guide to divorcing in Texas with children explains what changes when parents agree.
Who signs: Sign at Respectfully submitted.
A filled-in Form FM-Mod1-100 example: a parent in Travis County

How to fill out Form FM-Mod1-100, box by box
Cause Number, court and children's initials
Parties. Movant (You)

The Petitioner is the person asking the court to change the current court order. Print your full name.
Enter the state where your driver's license was issued and the last three numbers of your driver's license number, or check I do not have a driver's license. Enter the last three numbers of your social security number, or check I do not have a social security number.
Respondent(s)

Respondents are the people who must get legal notice of this case. Read the modification instructions at www.TexasLawHelp.org/modification-kit for information about who must be listed as a Respondent and given legal notice of this case.
For Respondent A, print the full name and the home address, then check one way you will give legal notice.
Check the first way if you believe Respondent A will sign a Waiver of Service or Answer.
Print the address where a constable should deliver this petition to Respondent A, if that address is different from where they live.
If you cannot find this Respondent and ask that this Respondent be served by publication, you must file an Affidavit for Citation by Publication, and a lawyer may be hired or appointed to serve as attorney ad litem for this Respondent.
Check Mother, Father or Other for Respondent A as the child(ren)'s, and for Other please explain.
There is no Respondent B, C or D when no one else is entitled to notice in this case: skip to Section 8, Information Required if a Party Lives Out-of-State. If there is a Respondent B, C or D, fill out the spaces for that Respondent.
Request to Change Current Order
Standing
Are You Asking to Change Custody within One Year?

Check one. I am not asking to change primary custody. I am asking to change primary custody, but it has been more than one year since the Court made the custody order. I am asking to change primary custody and it has been less than one year since the Court made the custody order, and I understand I must fill out and attach a Declaration in Support of Changing Primary Custody within One Year form to this Petition.
Information Required if a Party Lives Out-of-State
Legal Reason for Changing the Current Order

Check all that apply: the law allows the Court to change the current order because the changes will be in the child(ren)'s best interest and the Respondent(s) agree to the changes, or the circumstances of the child(ren), a conservator, or other party affected by the current order have materially and substantially changed since the Court made the current order.
Check all that apply: it has been at least 3 years since the current child support order was made by the Court, and the current monthly child support amount differs by at least 20% or $100 from the monthly child support amount that would be ordered using the Texas Family Code Child Support Guidelines (checked October 29, 2026).
Conservatorship (Custody)

A conservator is someone, usually a parent, who a court says has the legal right to make decisions about the child(ren), and the legal responsibility to care for them. Check one: I do not want to change conservatorship (custody), and skip to section 11, or I ask the Court to change conservatorship (custody) as follows: check a, b, c, d, e, or f.
a. Mother and Father should be Joint Managing Conservators of the child(ren), and if you checked a, check a-1, a-2, or a-3.
Possession and Access (Visitation)

Check one. I do not want to change possession and access (visitation), and skip to section 14. I ask the Court to change possession and access (visitation) as follows, and check a, b, c, or d.
a. Father should have standard visitation. b. Mother should have standard visitation. c. Standard visitation would be unworkable.
Child Support

Check one. I do not want to change current child support, and skip to section 15. I ask the Court to change current child support, and check all that apply.
Father should be ordered to pay more child support or less child support. Mother should be ordered to pay more child support or less child support. Other: describe.
Public Benefits

Check all that apply: the child(ren) have Medicaid now or had in the past, or get TANF (Temporary Assistance for Needy Families) now or got it in the past. If the child(ren) have ever received Medicaid or TANF, you MUST send a copy of this Petition to the Office of the Attorney General Child Support Division, and you MUST also sign the Certificate of Service on the next page.
Protective Order Statement

You must provide information about any protective order or pending application for protective order involving a party in this case or a child of a party. Check the appropriate boxes and fill in the requested information, if applicable.
You must also attach to this Petition a copy of any protective order (even if it's expired) in which one party or a child of a party was the applicant or victim and another party was the respondent or defendant.
If this petition does not accurately reflect whether there is a protective order, you may have to file a new petition and serve the other parties with it.
Check 21A, No Protective Order, if you do not have a protective order and have not asked for one. Check 21B, Pending Protective Order, if you filed paperwork asking for a protective order, and fill in the name of the party, the date filed, the county, the state and the cause number. Check 21C, Protective Order in Place, if you have a protective order, and fill in the name of the party it is against, the date, the county, the state and the cause number.
Request for Judgment
Certificate of Service on the Attorney General

If the Attorney General is listed as a party on your current order, you must have the Attorney General served by official service of process. Get the Attorney General's contact information from your current order.
Sign the Certificate of Service on the Attorney General only if the child(ren) receive or have received Medicaid or TANF, and bring proof of delivery with you to Court. Add your signature and the Date.
Sources
[1] Form FM-Mod1-100 Petition to Modify the Parent-Child Relationship (Rev. 09-2025), TexasLawHelp.org (the Official source link on this page).






