Maestro

I made a mistake there, meant to type CHE for Confœderatio Helvetica (although Swiss Confederation will correctly pop up)

Your "12 month retirement extension" is an extension of your temporary permission to stay in Thailand and for immigration purposes your country of residence is not Thailand. However, it is unlikely that indicating Thailand in that field will get you into any trouble.

For "Country of residence", the trick is to type the first three letters of the country name, eg gre for Great Britain produces a pop-up with a few county names that includes Great Britain; uni for United Kingdom gives a list that is too short to include that name, but continue trying and unit brings up the list that includes United Kingdom. Of course, if I happen to know the ISO three-letter country code, eg SWI for Switzerland or GBR for Great Britain, this is the most direct way to fill in the field for the country of residence. (Lower-case letters are also accepted for the codes)

I noticed the same on my phone. The trick is not to try to scroll, but to type the first three letters of the nationality, eg swi for Swiss, bri for British.

I have not yet seen an official list of required documents for an extension of stay based on a DTV. Could you post a copy of the list you received from the Jomtien immigration office, please?

Removed some more off-topic posts and the replies to them.

Please post about your personal experiences with the entry with the TDAC in this other topic: https://aseannow.com/topic/1358135-thailand-digital-arrival-card-tdac/ No need for a new topic.

Removed an off-topic post about a mobile phone service provider.

Removed some off-topic posts and the replies to them.

It is the day of arrival and the previous three days.

Yes, you cannot.

This is what the TDAC kiosks at Suvarnabhumi airport (BKK) look like for use foreigners who didn't do the TDAC before their arrival. Photo copied from a post in the Thailand News forum.

Tell the immigration official you entered the data on the TDAC kiosk, and he will know what to do

This topic is exclusively above how to get a TIN (Tax Identification Number) It is not about the requirement — or the lack of it — to pay taxes. There are several other topics discussing this. Further off-topic post will be removed without a public notice. If a post disappears, it is for the reason indicated above.

Removed an off-topic post about getting a visa from the Thai embassy in the Netherlands and another about "the late billioaire media mogul in Australia"

The facts: 1. The DTV is an elcronic visa (eVisa). 2. An eVisa is not a stamp or a sticker in the passport and therefore, there is no visa to "transfer" from the old to the new passport. 3. If the passport holder submits the form ขอให้ย้ายตราประทับลงในหนังสือเดินทางเล่มใหม่ TRANSFER STAMP TO NEW PASSPORT to the local immigration office with the required documents, the immigration official places a stamp into the new passport with information linking the new passport to the old passport. In addition, where applicable, visa information and some immigration stamps are copied from the old passport to the new passport. Thereafter, the passport holder no longer needs to carry both passports to travel; the new passport and, where applicable, a printout of the eVisa suffice.

We are talking about the UK and as far as I know, the law has not changed recently. In a case where a local council used a women's quota for the composition of its committee, the Supreme Court ruled that a so-called trans woman or transgender woman could not, on the basis of existing laws, be counted as part of the women's quota because the qualifying criterion must be the sex assigned at birth. The question of the legality of counting a transgender woman as a woman in sports events was not touched upon in this court decision. Currently, from what I have read, different sports organisation use different criteria for allowing transgender persons to participate in competitions limited to members of a specific sex. The news article quoted iin the OP does not mention what criteria are used by the organisers of the London Marathon. For this reason, I consider a discussion of this topic to be futile.

There are other ways aside the phone to do the TDAC.

24 May plus six months is 24 November. On the date of arrival in Thailand, your passport will have a remaining validity of six months and 22 days.

Yes, the OP's girlfriend and daughter can go through the fast lane at BKK, if they meet the criteria outlined by the airport authority. https://suvarnabhumi.airportthai.co.th/service/facility/detail/820

Already discussed and clarified in this topic: See this post, for example: https://aseannow.com/topic/1358135-thailand-digital-arrival-card-tdac/#findComment-19741392 No new topic needed for it.

No amendment of the current Immigration Act would be needed.

Removed an off-topic post about how the poster would design the form.

No. With the the current design of the form, it could not and would not be a problem.

There is also this topic about the passport use by dual nationals: https://aseannow.com/topic/1305176-immigration-news-for-all-thai-dual-citizens/?do=findComment&comment=18315531