NOW that you have reworded your questions... I'll attempt to answer...
.... The METV multiple entry tourist visa is only available in your home country.
I have placed the TOPIC of METV multiple entry tourist visa on your Post. CLICK on it and all posts about it will pop up to read.
The replies FROM
@Tod ********
are important to you in obtaining the METV.
... with planning as Tod suggests will get you up to 9 months stay in Thailand. It will require you to do two simple land border crossing BORDER BOUNCES...
And can be done same day if you want. Suggest you use an experienced border run service company to take you and your family to get the BORDER BOUNCE stamp.
... The Ed Visa for studying Thai Language is an option...but is 9 months of study...3 three months extensions. Contact a local School in the area where you will live. They can assist you.
...As I said by pm message before... you could enroll in a Thai university to obtain an Ed Visa for the years required to obtain the degree.
... And there's the Thai Elite Visa available for you...600,000 Thai baht Plus.... grants you 5 years stay in Thailand.
What is your passport nation?
What are the passport nations of your partner and child?