If his mind is, as you say, intact, then you should be treating him as you would any other adult. A physical disability requires the type of care that allows the person to come as close as possible to normal everyday functioning. What it doesn't require is someone else treating the person like they're a child, or intellectually disabled, or in need of any other type of care. He's an adult, you've said he's mentally sound, so that's it. He's got enough problems without other people acting like he needs even more hand holding than he does.
I'm sure you care for him, but ask yourself how you'd want to be treated in his case. If your mind was sound, but your body weak, would you want assistance doing only those things that you couldn't do yourself or would you want someone to act as a parent and give you unwanted advice as though you were a child?
I work with people with severe physical disabilities every day. They just wanted to be treated with the same respect and given the same consideration as everyone else. Sometimes that's hard, because there's a part of us that wants to care for people when they don't need it or want it, but that's OUR problem, not theirs.
Nexa
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“It has always been the prerogative of children and half-wits to point out that the emperor has no clothes. But a half-wit remains a half-wit, and the emperor remains an emperor.â€
― Neil Gaiman, The Sandman, Vol. 9: The Kindly Ones