one of them had been a cop named aloysius nell-mr. nell to generations of derry children walked up toward the picnic area near and it was only now , as he the place where harris avenue became the harris avenue extension , that it occurred to ralph that chris nell was probably old mr. nell 's son ... except that could n't be quite right , because the cop ralph had first seen in the company of john leydecker was n't old enough to be old mr. nell 's son .