I'd say "Avenging his parents' murder". That just seems like more of an Anti-Hero kind of trait.
preposition = under
object of the preposition = covers
The two protagonists are there to support each other and help each one succeed. Grant's story unfolds with Jefferson. The community involved in their path towards their destination is the black community and the Reverend. Grant was guided towards reconciling his insecurities regarding his race and also reconnecting to his roots, making this the first step towards his success.
all of the above..............
