Hello Ram!
Welcome and thank you for asking on HCM!
I am sorry about your father in law, but you should know that his situation seems to be really serious.
He may have had a
stroke, which has damaged most of his brain.
From the other hand, you should know that after the stroke, this part of the brain which is damaged begins to swell and compress the remaining part of the brain. This leads to
coma and irreversible changes. The prognosis is very reserved, because there is not much to be done.
Unfortunately, there is no cure to this clinical situation, and the only thing you can do is to wait and hope.
But, there are really low changes for him to wake up from Coma, considering the degree of
brain damage.
Hope you will find this answer helpful!
Kind regards, Dr. Aida