challenge: What is the relationship between Peregrine Bertie and Susan's mother?
  
  A. Peregrine Bertie is Susan's mother's second husband
  B. Peregrine Bertie is the son of Susan's mother's second marriage
  C. Peregrine Bertie is Susan's mother's first husband
  D. Peregrine Bertie is the brother of Susan's mother
  Answer: 