Grace Lily Snape is the daughter of Severus Snape and Lily Potter. Lily was married to James, but after she forgave Severus they both had an affair soon after Harry was born. Lily ended up getting pregnant. She couldn't take the risk of James finding out, she gave Snape two options: James and her would raise the child, or Snape could accept raising her. Before the child's birth, Lily and Severus met, Lily promised him if she survived the First Wizarding War she would divorce James and marry Severus.
*English is not my first language, so I'm sorry for any possible mistakes!
CAST
India Eisley as Grace Snape
Kaya Scodelario as Astoria Greengrass
Keith Power as Blaise Zabini
Peyton List as Melia Rosier
Bailee Madison as Megan Avery
Elle Fanning as Ella Wilkins
Allie Deberry as Selina Rosier
Saoirse Ronan as Daphne Greengrass
Kiernan Shipka as Susan Bones
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Snape and Lily's daughter
FanfictionLily actually forgave Snape after he had called her a mudblood. They have an affair and later Grace Lily Snape is born.