Mrs Birling's Family Expectations and Shame
Sybil Birling expects her family to maintain perfect upper-class behaviour at all times. When she discovers that Eric is the father of Eva Smith's child - the same woman she turned away from her charity - her world crumbles. Her comment "I must say we are learning something tonight" shows how shocked she is by her family's failures.
The irony becomes devastating when Sybil demands they "go and look for the father of the child" without realising she's talking about her own son. This moment perfectly captures how her class prejudice blinded her to the truth. She dismissed Eva partly out of spite because Eva dared to use the Birling name.
Her embarrassment and shame aren't about the harm caused to Eva, but about how her family's actions might damage their social reputation. This shows how the upper classes prioritised appearance over morality.
Key Point: Sybil's shock comes from her family not living up to her classist expectations, not from genuine moral concern.
