Sentence 1: Charles was excited about taking a road trip with his grandfather. 
 Sentence 3: Charles heard his grandfather was in ill health with diabetes 
 Sentence 4:  About twelve hours into the trip they pulled into a restaurant 
 Sentence 5:  Charles, in amazement, watched his grandfather eat a large burger 
 Option 1: But he worried about his grandfather's health. 
 Option 2: His grandfather was in great shape and was given a doctor's OK.