When former Celtics forward Cedric Maxwell was a child, he and his family were on a summer road trip from their home in Kinston, N.C., when they stopped at a gas station in Waycross, Ga. Maxwell and his brother went to the bathroom, but they were small and no one really noticed them. “My mother was waiting with my sister outside to go in after we came out, and the guy in the gas station said, ‘No, miss, your bathroom is outside, in the grease pits,’ ” Maxwell recalled Monday. “My father, who had been serving in Vietnam, went off. He said, ‘I fought for this country. I got wounds. I almost died and I can’t even use the damn bathroom?’ ”