Delicate

My father in law is living with us. He went to the doctor today and we were told he is delicate. I admit I am not the sharpest tack in the box. I will also admit I am not the most political correct person in the world. But, what does delicate mean? The doctor said it meant he could go at any time.

Years and years ago a doctor said my Grandma was “fragile”. She lived eight more years. So I am wondering what is the difference between delicate and fragile?