My Father was type 2 as well.
When I was diagnosed I was overweight, so I cut carbs and calories and lost a lot of weight in 3 months.
This seemed to get thinks back to normal. I didn't do any testing for that 3 months.
I used recipes from cookbooks by Giancarlo & Katie Caldesi. Giancarlo developed T2D and went low carb to get back to normal. This one is the one I used most:
I have other books by him (And others). I pretty much eat chicken/fish and veg plus nuts, yoghurt, berries these days.
Although I have found that I can handle oats and potato and am no as strict with my diet anymore.
Last night I made a delicious dish which was fish in a sauce made from leeks, onions, garlic, tomatoes and parsley. This was from another Caldesi book.
Some people do a 'shake' diet, but I tried a shake once, and decided I prefer proper food. The Caldesi recipes are extremely tasty.