Beneficial interest

please calrify in reference to sec 40A(2)(b) of incomr tax act, 1961. what is thr definition of benficially entitled to 20% or more of equity/ votind rights? Can I say a subsidiary of assessee's subsidiary is a related party under 40A(2)(b)??although the same is covered by Accounting Standard 18. please clarify as i need to finalise a tax audit. quote judgment if any.