In brief, I suggest you Google for Dr Davide Unwin's diet sheet, Zoe Harcombe's What should we eat, and if not already mentioned the Freshwell low carb programme. The main thing is to focus on nutritious foods with plenty of protein and healthy fat plus vegetables. All things equal this will keep your husband well fed, lead to T2D remission and then to reversal of his fatty liver which will restore his liver and pancreatic functions to normal.
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Please note many people gradually build up fat in their liver, and BG levels, over a decade or so before T2D breaks out. This seems to be the case with over 90% of the newly diagnosed. Waist measurement is usually a good indicator