Yes both, however if one is over 50 and the other isnt . .they can apply for dependent visa.
The other route if only one can do it now the other can apply for a Non-O A visa which has income requirements this will help with long term stays such as educational visa help save or build to DTV.
There are many routes to do this if you do not have combined total of 1.6 million baht right now.
they are resuming what they put a halt to. They were always doing it just after covid restrictions they stopped proof.of income for tourist visa 20,000 baht for a while they are now resuming it.
Even under visa exempt status they *can* ask you to provide proof of at least 20k equivalent in your currency which is 500$ USD
The agent i work with on alot told me they were resuming this requirement
they stopped doing it after covid restrictions to foster more tourism was all now they are going back to it, its not a change just simply resuming what they put a halt to