United first class report:
I was on separate reservations from my kids, but got upgraded automatically and they gave my seats on two flights to someone else. Took some negotiation with the gate agent, but was able to get them to the first row of economy plus.
Was there an open seat in my kids' row on one of the flights? Yes.
Did I stay in first? Yes.
Did I get judgy vibes from the flight attendants? Yes.
Did it stop me from slamming bourbon on the rocks? No.
Did one guy sitting next to me snort snot loudly, a lot? Yes.
Did a lady in first try to put her laptop bag behind her seat in my kids' space instead of in the infinite space in the seat ahead of her? Yes.
Did a guy across the aisle from me take off not just guys shoes, but his socks, and put his bare feet all over the bulkhead? Yes.
Did this, combined with sufficient bourbon, send me back to that open seat next to my kids for the last half of the flight? Yes.