Sort of related:

If I wanted to book two tickets (one for me, one for my brother) but wanted to buy my ticket and use miles for the second, how do I go about doing that on a single PNR? Could I do this online or would I have to call in. Would this be the same if I wanted to buy both tickets, or get two award tickets?

Sounds like, if I travel as a companion (brother) on one PNR they can access the P/E seats, correct?