Lord, I come in agreement with the prayer for healing here. Father, you went to the cross to take all sickness from us; we are healed by Your stripes! (Receive your healing and continue to believe you ARE healed until you see it manifest in the natural!). Praise You Jesus; you are the great physician. We do not accept the diagnosis of the doctor; we rely on YOUR report only! The doctor's limited claims are not ours and they are unacceptable!
Your grandfather IS healed; this was the promise made at the cross. Remove the unbelief and do not accept the lies from the enemy; do not believe the report from the doctors. Believe only in Christ's healing for your grandfather. I cannot stress enough that you must remove any doubt.
God bless you.........