this method is not available in Thailand or evisa anymore.There were reports that Australia still allows it. If they are American they will have to contact the embassy and see. The 90 day over 50 visa dependant/follow visa is near impossible now. BUT once in Thailand on second extension you could possibly change the reason of extension from retirement to dependant. Office specific of course.For whatever reason they are getting rid of the retirement dependant category. We did it from Canada a few years ago but can no longer be done there.