text: 
  
  class Kid:
      def __init__(self, name=None, age=-1):
          self.name = name
          self.age = age
  
  
  class Family:
      def __init__(self, parents=[]):
          self.parents = parents
          self.kids = []
  
      def __str__(self):
          return_str = "Family:\n"
          return_str += "  Parents:\n"
          for parent in self.parents:
              return_str += "    "+parent+"\n"
          return_str += "  Kids:\n"
          for kid in self.kids:
              return_str += "    " + kid.name + ", " + str(kid.age) + "\n"
          return return_str
  
      def add_kid(self, kid=None):
          self.kids.append(kid)
  
  
  