The Great Generational Divide
Picture this: it's 1912, and social class determines everything about your life - who you marry, where you work, even how people treat you. In Priestley's world, the older generation (Mr and Mrs Birling) act like they own the place, expecting complete respect from anyone younger or poorer than them.
The Birling parents represent everything stubborn about the older generation. Mrs Birling refuses to admit she was wrong about Eva Smith, saying she was "perfectly justified" in denying help to a desperate girl. She's heard about all of Eva's suffering but won't budge an inch - classic older generation behaviour in this play.
Mr Birling's even worse, treating his grown children like toddlers with phrases like "I don't like that tone." He finds it dead easy to blame the younger generation for everything whilst taking zero responsibility himself. His power as the family patriarch means he expects everyone to fall in line.
Quick Tip: Notice how Priestley uses the parents to represent the unchanging, stubborn attitudes of 1912's upper classes - they're symbols, not just characters.
