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On the night that Voldemort went after the Potters, he killed James when he got in the way, but, he merely knocked Lily unconscious. When she came to, Harry's cot was empty and her husband was dead on the floor downstairs. Lily thought that Voldemort has killed her son. She was devastated, the only thing that kept her going was the child growing inside of her. She had been about 5 weeks pregnant when James and Harry were killed. When she finally gave birth to a beautiful baby girl, Lily went to two people for help. The first was Severus Snape, Lily asked him to help raise the girl. He said no because even though she had Lily's red hair and green eyes, she was the offspring of James Potter. The second person Lily went to really surprised her. When she asked them to help her, they said yes. Lily just had to agree to help them in return.