Thanks , why i consider my dad isnt so obese , ykno medically my dad is super obese , but his body (from my POV) isnt so big like other 330 lbs man although his height only 5'4 ?

My father was 47 years old , weight around 330 lbs with height 5.4 feet , bmi OVER 54 . Any suggestions ? I want him to live till i have child or atleast married. He have some weird "diabetes" too much insulin , and his feet are swollen up with blackish color , think he dont have heart disease , he is ex smoker around 30 years ago.