I am sure your grandfather had a hemorrhagic stroke
The bells palsy
and the weakness is due to it. The orthostatic hypertension
does develop during recovery.
If i were your doctor i would have checked his CT scan
. Normally in Neurosurgery evacuation is done only for hemorrhages greater than 70-100 cm3 and it has to be compressing the brain matter
If it is less than that and there are no signs of compression then it is left as such. Surgery is not indicated in that case.
The clot resolves followed by fibrosis
and ultimately normally leads to a full recovery.
I believe if your doctor has not proceeded to surgery then it is because it doesnot meet the criteria for surgery.
In this case it might not be beneficial to perform a surgery.
I hope you find my response helpful
Dr. Ammar bin Ahsan