Who is Kamal al Soukori from The Haj and what is their importance?

Kamal is an older brother of Ishmael. He knows how to read and write and that is his position in the family. He works with his father and keeps the books and collects the rents. He is with the family in the cave and in the camps and works for the Iraqi Army, along with Ishmael. When the United Nations takes over the camps, Ibrahim secures a job for Kamal.