WARWICK — Robert Guerra kissed the casket of his son, John. Then he made his way to the front of the church to deliver the eulogy Saturday.John Guerra, who died Monday at 17 in a car crash on Union Corners Road, was a standout basketball player at S.S. Seward Institute. As he spoke, Robert held a little practice basketball that John and his friends would toss around the house.“This was John,” Robert Guerra said, as he held up the basketball.