Form FM-Mod1-100 PDF Details

Fill in the cause number and court information exactly as written on the orders or decree that you want the court to modify.

Standing: Read the law about standing in Texas Family Code 156.002, 102.003, 102.004, and 102.006.

One year: To change primary custody under one year after the order, attach a Declaration in Support of Changing Primary Custody within One Year form to this Petition.

Out of state: If someone involved in the case does not live in Texas, attach a completed Out-of-State Party Affidavit.

Protective orders: You must provide information about any protective order or pending application involving a party or a child of a party.

Attorney General: If the child(ren) ever received Medicaid or TANF, send a copy of this Petition to the Attorney General Child Support Division.

QuestionAnswer
Form NameForm FM-Mod1-100
Form Length17 pages
Fillable?Yes
Fillable fields297
Avg. time to fill out50 min
EditionRev. 09-2025
Matches the agency's fileYes, checked November 3, 2026
Other namesTexas petition to modify, child custody modification form Texas, motion to modify custody, petition to modify the parent-child relationship, FM-Mod1-100
Official sourceForm FM-Mod1-100 Petition to Modify the Parent-Child Relationship (Rev. 09-2025), TexasLawHelp.org

How to Fill Out Form FM-Mod1-100

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

Form FM-Mod1-100 example filled out, example: a parent in Travis County
Jane Ann Sample files Form FM-Mod1-100 to modify a custody order. Her case is in the 345th District Court in Travis County and covers one child. She has no driver's license, so the license state and number boxes stay empty, but she has a social security number, so I do not have a social security number stays empty. Because the case is in District Court, County Court at Law stays empty. The one Respondent is the child's father, who will sign a Waiver of Service or Answer, so Serve Respondent A stays empty and there is no Respondent B. She is the child's mother and asks for no change to custody or visitation, so the Conservatorship (Custody) and Possession and Access boxes for a change stay empty. She asks for more child support from the father, and because the child gets TANF she signs the Certificate of Service. Everyone lives in Texas, the circumstances have materially and substantially changed, and no one has a protective order or has asked for one. The picture shows page 1 only, and none of its entries is real.

How to fill out Form FM-Mod1-100, box by box

Cause Number, court and children's initials

Form FM-Mod1-100 example filled out, cause Number, court and children's initials

Fill in the cause number and court information exactly as they are written on the custody orders or divorce decree that you want the court to modify, and print the initials of each child.

Write the court number for District Court or County Court at Law, and write the county name.

Parties. Movant (You)

Form FM-Mod1-100 example filled out, 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)

Form FM-Mod1-100 example filled out, 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.

Child(ren)

Form FM-Mod1-100 example filled out, child(ren)

Print the Child's Name, Sex and Child's Date of Birth for each child this case is about.

Request to Change Current Order

Form FM-Mod1-100 example filled out, request to Change Current Order

Print the name of the order that you are trying to modify. Print the date the judge entered your court order. This is either the date when you appeared in court, or the date the judge signed the order. It is usually the earlier date.

Standing

Form FM-Mod1-100 example filled out, standing

Standing is a person's interest in a case that allows them to file a lawsuit. Check all that apply under The law allows me to file this case because I am, for example the child(ren)'s mother, the child(ren)'s father, or listed as a party in the current order and affected by the current order.

Are You Asking to Change Custody within One Year?

Form FM-Mod1-100 example filled out, 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

Form FM-Mod1-100 example filled out, information Required if a Party Lives Out-of-State

Check one: everyone involved in this case lives in Texas, or someone involved in this case (one of the Respondents or me) does not live in Texas and you attach a completed Out-of-State Party Affidavit to this Petition as an exhibit.

Conservatorship (Custody)

Form FM-Mod1-100 example filled out, 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)

Form FM-Mod1-100 example filled out, 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

Form FM-Mod1-100 example filled out, 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

Form FM-Mod1-100 example filled out, 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

Form FM-Mod1-100 example filled out, 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

Form FM-Mod1-100 example filled out, request for Judgment

I ask that citation and notice be issued as required by law. I ask the Court to make the orders I have asked for in this Petition and any other orders to which I am entitled. I ask for general relief.

Print your full name, your full address, your email address and your phone number.

Certificate of Service on the Attorney General

Form FM-Mod1-100 example filled out, 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).

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