Hi, so sorry to read your story, I think he will need a tourist visa first, I tell you my story my partner and my child British citizens we lived in Mexico until he was diagnosed with multiple sclerosis and got really worse to the point he couldn’t walk as mexican I don’t need to apply for a tourist visa so we came together in January 2017, as we lived here previously they did ask me loads of questions, at that time I just said I’m here to bring him and mi child back as his condition has really worsened up he said ok but you can’t stay beyond 6 months without further clearance. If you have the financial requirement it would be more
Convenient for your husband to bring you and return to South Africa to apply for a visa if you don’t have the requirements then he can apply from here flr fp but it is a very long long wait, we don’t have the financial requirement cause he needs pip and he can’t yet because he needs to be living here for a continuous 2 years I applied here and they refused my application after 4 months that is lucky there are some which wait for over 13 months for even a rejection now I’m waiting for my appeal hearing in June with support documents, doctors, nurses, evidence that in Mexico there is not treatment for ms, so as long as you have your documents I really hope he gets his tourist visa and can come with you, update me and all the luck in the world for you, have a safe journey