Who is Faizullah? What is his relationship with Mariam?

Mullah Faizullah is Mariam's tutor, who teaches her more than just lines from the Koran and how to read. Over time, Mullah Faizullah becomes a source of strength and comfort for Mariam. Often Mariam confides in Mullah Faizullah, as he respects her not only as a student, but he also recognizes her potential for greatness. After Nana's death, Mariam begs to be allowed to live with Mullah Faizullah, but Jalil refuses.