How would you describe the relationship between Rufus and Dana in Kindred?

Dana and Rufus have an extremely complex relationship because when Dana travels into
the past, she is a slave while Rufus is the plantation master, but she also later finds out that
she is biologically related to Rufus. Dana's relationship with Rufus is typical of slave-master
relations in many ways. 

Dana is an adult woman living in the 1970s when she
is inexplicably transported to the antebellum South. As a black woman, she is automatically
considered a slave in the past, even though she is a professional writer in her "real
life" in 1976. While she is a slave on the plantation, she is mistreated and beaten, as the
other slaves are. However, because of her historical knowledge and intermittent returns to the
1970s between trips to the past, she is better equipped to survive the hardships she must
endure. Even though Rufus is very young when Dana first arrives, on later trips, he has grown up
and become the master of the plantation. He can often be cruel, exerting the full force
of...