A few names for a person you blame your problems on are scapegoat or victim. In slang: Blame-y.
Leo Trotsky
whom or who does Sacco blame for his conviction
A person of whom you are a guardian is typically referred to as a ward.
You call them 'The person I owe money to'
Eponym
You are descended from ancestors.
on whom does Cassius blame caesars power
The Victum
Call the office of the person with whom you have the appointment.
The other animals
His mother
The British.