"A villian kills my father, and for that,
i, his sole son, do this same villian send to heaven."
(3.3.81. Hamlet)
Four Brothers and Hamlet are connected by the fact that in both stories a parental figure was killed. In hamlet it was the father, in Four Brothers their foster mom was killed. The quote relates to both stories because both want revenge for their loved one, and justice is only given with the death of the one who did it.
Will Hamlet ever get his revenge for his father and kill Claudius?
Will Hamlet do it himself or will he get someone to kill Claudius for him?
Hire and salary: i.e., something Claudius should pay me for.