In what ways do they differ in terms of how they look upon women and life in general?

Parvez, a Punjabi immigrant, has become thoroughly assimilated into Western society. Though raised as a Muslim, his attachment to his religion is tenuous, to say the least. This mainly arises from his experiences as a child, when he was humiliated by a Moulvi—a Muslim doctor of the law—while studying the Koran. As part of his Western lifestyle he eats pork, drinks alcohol, and consorts with prostitutes, all modes of behavior strictly forbidden by the Koran. His attitude to women is thoroughly modern, in sharp contrast to that of his son, Ali, after Ali becomes a devout Muslim.
Ali comes to hate what he sees as the shallow materialism of the West. To him, it's the exact opposite of everything set out in the Koran. Islam is a way of life, not an optional extra; it's something you have to live out on a daily basis. This means, among other things, growing a beard, refraining from drinking alcohol, and no longer having casual relationships with women. Ali comes to adopt a regressive attitude towards women. We see this in how he relates to Bettina, the prostitute. As far as Ali is concerned, Bettina is representative of Western women in general. Though they may not engage in paid sex work, their sexually liberated behavior is little better than prostitution in his eyes. Women, for Ali, should be chaste and pure, their world confined to the home in the traditional roles of dutiful mother and wife.