What are the financial requirements for dependents when applying for a retirement visa in Thailand?

What is considered 'wealthy pensioner ' in Thai eyes, to allow for dependants ?

Is WP a legal term with some visas ?

LTR Wealthy Pensioner would be an option if your spouse is qualified.

Then he or she can add up to four family members on his/her visa.

You CANNOT get a trailing spouse non-O visa inside of Thailand. It is not offered and has not ever been offered. The only embassy in all of SE Asia that used to offer it no longer offers it anymore.

Most embassies around the world no longer offer a trailing spouse non-O visa if the over 50 spouse also has a non-O visa.

SOME embassies are willing to sell the 2nd spouse a non-O trailing spouse visa only if the primary spouse purchases a non-OA visa from the embassy, but this is not that common either.

For the most part there is no more trailing spouse for retirement. Both spouses must qualify for their own visas. You can check with your embassy to see if they will sell one of you a non-O visa based on being over 50 and the other spouse a non-O trailing spouse visa, or if they will sell one a non-OA and the other one a non-O, but don't count on this being an option.

For child dependents there should not be any financial requirement, but you would need to check with the embassy outside of Thailand or your immigration office inside of Thailand as they each make their own policies.