How can I take care of my Dad who recently had breathing problems and was admitted to hospital?

I suggest you go on line & look it yourself....there is much out there.

You also should talk to the primary care physician & social service where you live.

You can not MAKE your Dad do anything. If his problems include alcohol and toabacco all you can do is not be an enabler. if you are cooking for him you can prepare only healthy meals for the whole house hold and keep unhealthy snacks like candy out of the house. If he can still go out independently he will still go and buy whatever he fancies. At 65 he is unlikely to want to change his habits so do what you can and make early decisions about his future care. Taking on the care of an elder is not something you should take on automatically it will consume your whole life. Look for alternatives before it becomes a reality. because he was given oxygen in the hospital to help with an illness does not necessarily mean he has to continue. talk with his Dr about future care .

Has the doctor ordered oxygen at home? For healthy eating, Google the Mediterranean diet.