Answer:
Mrs Sybil Birling is Arthur Birling's wife and right from the opening of the play she is cold-hearted and snobbish despite being a prominent member of local women's charity. Mrs Birling treats the Inspector as an inferior. She is disgusted when she learns that Eva / Daisy was Gerald's mistress. She persuaded the charity not to help the pregnant girl. She blames the girls' death on the father of the child – who turns out to be her son.