Originally Posted by IsleTraveller

Forgive me if these issues have already been addressed. The questions have been asked in other threads but the answers are not clear to me (I am not that smart, I suppose).

Booked UA flight to US on AC site. I am travelling with my wife and young son.

1. I have lounge access as I am AC SE. I definitely know that I am allowed to have one guest. Will they BOTH be allowed access? Previous posts say yes, others say no - UA site says only one guest but does not mention family members being admitted.

It will depend on the lounge agent, she/he may, or may not. Technically, you can bring ONE guest, but most human agents will allow your son

2. but could not select seats at time of booking, nor can I do it now. When/how can I book seats?

You can call UA and book your seats directly with them. You can ask for E+ seating, but you will probably be turned down

3. Do I have access to the economy plus seats (I think this one was answered as a "no").

No, sometimes they will put you there at the gate or during checkin. Depending on the length of the flight, you can pay for the upgrade. All depends on how long and how much.
Looking forward to being enlightened.