Tiger victim's kin file claim against San Francisco

• Story Highlights
• Carlos Sousa Jr. died last year after the Siberian tiger escaped its zoo enclosure
  
• Two of his friends were also hurt before police shot the tiger dead
  
• Sousa's parents allege the city did not properly house the tiger
  
• The city has 45 days to respond to the wrongful death and negligence claim
  
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