a complex congenital heart defect and endured eight traumatic open heart surgeries in a bid to save his life .
his greatest wish was for his parents jemma , 21 , and craig , 28 , to tie the knot , but despite getting .
engaged three years ago , his ill health put their plans on hold .
corey , who was born with a complex congenital heart defect , held the rings at his bedside in bristol children 's hospital .