code: def listBlockChildren(self, block_name=""):
          
          if (not block_name) or re.search("['%','*']", block_name):
              dbsExceptionHandler("dbsException-invalid-input", "DBSBlock/listBlockChildren. Block_name must be provided." )
          conn = self.dbi.connection()
          try:
              results = self.blockchildlist.execute(conn, block_name)
              return results
          finally:
              if conn:
                  conn.close()
docs: list parents of a block