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The TED parent subscriber is first a subscriber, and can receive distributions if they are subscribed to a channel. A parent subscriber has the additional responsibility to take the distribution and pass it along to a set of designated subscribers. In this manner, a parent subscriber acts as a relay transmitter for the distributor and relays the distribution onto other subscribers. Any subscriber can become a parent subscriber without any software change. The subscriber needs to be designated a parent only in either the distributor's routing hierarchy or in a subscriber object.
There is no parent subscriber object that is created in NDS. A subscriber acts as a parent subscriber any time it is identified in either another subscriber object (as that subscriber's parent) or as an entry, with a child subscriber, in the routing hierarchy of any distributor.