class_docstr: Class to represent a relationship between dataframes
  
  See Also:
      :class:`.EntitySet`
class_docstr_tok: ["Class","to","represent","a","relationship","between","dataframes","See","Also",":",":","class",":","`",".EntitySet","`"]
code: def to_dictionary(self):
      return {
          "parent_dataframe_name": self._parent_dataframe_name,
          "child_dataframe_name": self._child_dataframe_name,
          "parent_column_name": self._parent_column_name,
          "child_column_name": self._child_column_name,
      }
  
label_desc: Use image node_id 12 for calling the Relationship obj's underlying member method code with example usage: obj.to_dictionary() and returns: dict