My Cousin had a heart attack
Without her knowing or her Doctor's knowing she was part of a blind study in the hospital where staff would meet and pray for several patient's every day.
When she returned for follow up, they couldn't find any evidence that she had even had a heart attack even though they had records showing permanent damage.
Don't know how it works, but when I was a Chaplain at Church, they taught us in training many studies showing the power of prayer.
You, your Mom and Dad are also in my prayers for a complete recovery!