Final answer:
Soraya moves in with Amir and his father post-marriage due to cultural expectations and the value placed on family in Afghan society, echoing the themes of duty and support within close-knit families.
Step-by-step explanation:
It's worth noting that this question seems to be a conflation of two different works of literature; Soraya is a character in Khaled Hosseini's novel The Kite Runner, whereas the excerpts provided do not pertain to this novel but rather to a range of different narratives involving other characters and situations that discuss various aspects of marriage, independence, and societal roles.
In The Kite Runner, Soraya moves in with Amir and his father because of the strong cultural emphasis on family and the expectation that she cares for her in-laws. Also, it is a sign of respect and duty, a way to remain close-knit and support one another, reflecting the Afghan value system they uphold in their daily lives.