Dads diabeties got worse

My dad has diabeaties (sorry I dunno how to spell it), and in his last check-up the nurse said if he didnt drink more water, do more excericise, and drink less alcholhole he might have to go onto injecting himself. Right now he just takes lots of pills, and as his diabeaties have got worse he has had to take more and more pills, right now he is at the top of pill taking, if his diabeaties gets worse he HAS TO inject inciline. I’m really worried about him, now he has to drink a whole huge litre of water a day, and really cut down on his wine, only two bottles a week, and walk twise each day. I’m walking with him, sometimes, and reminding him to drink water, but im scared he’ll forget and his diabeaties will get worse and more serious. Also it cant be very fun for him, he cant eat any sweets, and his wine is like his chocolate to him, its his nice thing. And now he cant even have that, all he is eating is fruit, vegetables and beans and stuff (hes veggie) and drinking water a lot. And he’s not getting much me time to himself, since of all the walking and his work pilling up and stuff. He really really doesnt want to inject, thats the worst possible outcome, when he came back from the doctors from his check-up, he looked close to tears to me. And what if I get diabeaties? If this is how hard it is I really dont want it! Is it past down in the family or something? Please give me some advice and reasurane, because im scared and worried for him and for me if I get it.