What is Willy's philosophy? How does Biff as af ootball hero embody his father's dreams? Why does Charley say Willy hasn't grown up?

Willy wants to lead the American dream. He thinks he will merely fall into it without hard work. Mere perseverance chasing the dream rather than working at something is his motto. Biff idealizes his dad but like his dad is not a star. He is good at football but not that good. An injury destroys any dream of football. Willy has not grown up because he still has childish illusions about being rich and living the American dream.