How does patriarchy play a part in The God of Small Things?

Roy tells
the stories of various husband-wife couples whose relationships are distorted because of the
patriarchal structure.  The most obvious example is that of Pappachi and Mammachi.  Pappachi
rules his household like a demented despot--beating his wife and children and destroying their
prized possessions.  Chacko, though less aggressively, than his father, is responsible for his
failed marriage.  He has no job, but he refuses to help out around the house, and turns into a
lazy slob.  Ammu's husband is willing to prostitute her to save his job.  Roy gives example
after example of...