Lily J. Potter's letter to Petunia Dursley

 {{ Pottermore

On or after 31 July, 1980, Lily Potter sent a letter to her sister to her elder sister Petunia Dursley announcing the birth of the former's son. However, Petunia merely and contemptuously tossed the letter in the trash after one look. This was the last known piece of correspondence between the Evans sisters before Lily's death at the hands of Lord Voldemort less than two years after the letter. Prior to the letter's delivery, Lily and Petunia had all but parted ways due to the former's magical abilities.