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What is the correct way to fill out the Affidavit of a Family Member Form for visa extension in Thailand?
Affidavit of a Family MemberVisa ExtensionThai ChildThai ImmigrationForm STM.10Witness RequirementsFamily Member Confirmation
Dec 28, 2025
4 months ago
Colin **********
ORIGINAL POSTERAffidavit of a Family Member Form
Immigration gave me this form for my visa extension. Support of a Thai child
Its a new form to me, but I want to get it right. As I understand it it's a family member confirming your family.
The first part looks like its filled in by the family member, can this be anyone? Wife? Mother in law?
Second part my details?
Third part
Signature 1. Family member
Signature 2. Competent officer? Imm officer?
Signature 3. Witness? Who can sign?
KR
Immigration gave me this form for my visa extension. Support of a Thai child
Its a new form to me, but I want to get it right. As I understand it it's a family member confirming your family.
The first part looks like its filled in by the family member, can this be anyone? Wife? Mother in law?
Second part my details?
Third part
Signature 1. Family member
Signature 2. Competent officer? Imm officer?
Signature 3. Witness? Who can sign?
KR
TLDR : Answer Summary
The Affidavit of a Family Member Form is required for visa extensions related to Thai children. The first section is to be filled out by a family member, which can include a wife or mother-in-law. The second section requires the foreign parent's details. There are spaces for three signatures: the family member, a competent immigration officer, and a witness. The witness must provide a copy of their house book and ID card. Specific guidelines about completing the form are mentioned, particularly for situations where the Thai child is not of legal age, in which case the foreign parent signs on their behalf.
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Jamie ********
If you arrive on a 60 day exempt then get a 30 day extension. Can you use this form to get another extension if you have a Thai child? Thanks.
Tod *********
@Jamie *******
no you use the TM7 application for extension formBUT
we're seeing more and more offices not allow the 60 day visit thai family extension on free stamp/tourist visa entries so check with your office well before you're going to attempt it to see if it can even be done there
Reply to
Tod *********
Reply
Ron ******
@Colin *********
You normally require a copy of the house book and ID card of your witness, signed and dated.Tod *********
@Ron *****
and you are speaking from experience, having used this form at the immigration office where you get your yearly extension?Ron ******
@Tod ********
I've used this form, we used a neighbour that knows us. We were told by our immigration office that a friend or headman was acceptable as well. Not sure about a relative, that's why I said check with his local office.Tod *********
@Ron *****
thanks for that. Appreciate the info..Ron ******
@Tod ********
Unless it has recently changed, the STM.10 was not on the list of forms for download from the official website. It was handed out by immigration offices when they required it to be completed. So if they give you one best to check who can witness as like everything requirements are office specific.Tod *********
Reply to
Tod *********
Reply
Colin **********
ORIGINAL POSTER@Ron *****
who can witness it?Ron ******
@Colin *********
Neighbour, friend, village headman if you live rural. Relatives are usually accepted but maybe check with your immigration office. Basically anyone who knows you.Reply to
Ron ******
Reply
Dca *****
Form STM.10 is filled out by the Thai Citizen Child (or in the viewpoint of the Thai Citizen Child if the Thai Child is not yet of legal age)
if the Thai Child is not yet of legal age, then you as the Foreigner Parent would sign Form STM. 10 on behalf of the Thai Citizen Child, or the Thai Immigration Officer will give instructions for what to do
in Sections 1, 2, and 3, the Name/Details to specify are you as the Foreigner Parent
this Form STM. 10 is mandatory and used by all Thai Immigration Offices across Thailand
if the Thai Child is not yet of legal age, then you as the Foreigner Parent would sign Form STM. 10 on behalf of the Thai Citizen Child, or the Thai Immigration Officer will give instructions for what to do
in Sections 1, 2, and 3, the Name/Details to specify are you as the Foreigner Parent
this Form STM. 10 is mandatory and used by all Thai Immigration Offices across Thailand
Colin **********
ORIGINAL POSTER@Dca ****
thanksReply to
Colin **********
Reply
Tod *********
your data in the middle, family member on the top, immigration officer signs it, never seen that anyone had to witness it before
they started handing those out in Bangkok this last year for marriage/raising child extensions
they started handing those out in Bangkok this last year for marriage/raising child extensions
Colin **********
ORIGINAL POSTER@Tod ********
thanksReply to
Colin **********
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Reply to
Tod *********
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