What are some of the advantages and disadvantages of practicing polygyny in El Nahra?

Discuss, in as much detail as possible, the kinship system as described in Guests of the Sheik. What are some of the advantages and disadvantages of practicing polygyny in El Nahra? How might this compare for women who live in a matrilineal, matrilocal system? What does this book tell you about ethnographic methodology, and what is this method called?