What did General Taheri discourage the couple from doing?

After months of trying to conceive, Amir and Soraya consulted fertility doctors. Neither of them had any detectable fertility problems, but they were still unable to have a child. When they told Soraya's parents, General Taheri and Khanum Taheri were disappointed. The general urged them not to adopt, most of all because Afghan society depends on the line of succession, which the act of adoption obliterates. Amir thought privately that his and Soraya's infertility was punishment for his betraying Hassan so many years before. Soon after they discovered they could not have a family, Amir and Soraya bought a house. Despite their newfound material comforts, the absence of a child tormented them both.