law: Indian Contract Act, 1872 
  42. Devolution of joint liabilities
  When two or more person have made a joint promise, then, unless
  
  a contrary intention appears by the contract, all such persons, during their
  
  joint lives, and, after the death of any of them, his representative jointly
  
  with the survivor or survivors, and, after the death of the last survivor the
  
  representatives of all jointly, must fulfill the promise.