Two daughters ran away to join Islamic State. Years later, their family's story is an Oscar nominee

Olfa Hamrouni doesn't know much about her granddaughter; not her favorite toy nor food — is it the pasta the child's mother loves, or something else?

The Tunisian grandmother doesn't even let her mind go there. "I don't want to know. What for but more heartache?" she said.

For now, she just fights for 8-year-old Fatma. The child has spent virtually all her life with her mother and aunt — Hamrouni's eldest daughters — raised in detention in Libya, where the women wound up after leaving home as teenagers and joining Islamic State group extremists.

The real-life story of Hamrouni and her children...