How do various parents say good-bye to their sons in the film, Dead Poets Society?

The various parents have different ways of saying good-bye to their sons. Charlie Dalton's mother brushes the hair out of his eyes and hugs him. Knox Overstreet's father given him an affectionate squeeze as they walk around the campus looking at landmarks. Neil Perry's father stands stiffly and adjusts the achievement pins on his son's jacket. Todd Anderson's parents chat with another couple and ignore him. One father tells his son he will love it at the Academy as he leaves. Another parent tells his son not to be a baby.