BG: My BF has always felt like the black sheep of his family, and feels like he is always unfavorably compared to his Older Brother. OB and BF's Dad were working on a project today, and called BF early in the morning with no notice telling (not asking) him that he was to come help with it. BF hesitated, as he had had no idea he was going to be doing this and had been up quite late the night before, BF Dad's said nevermind, and that was the end of the conversation.
So BF called his mother to find out what time dinner was, and there was some conflict about BF not helping. BF says it's likely dinner will be tense, and an argument might break out, particularly since OB may fan the flames. He wants to attend dinner anyway since not going will be held against him. He has specifically told me he wants me to stay out of it if that happens, since he doesn't want his parents to feel hostile toward me.
My question is: what is the acceptable thing for me to do if an argument starts up? It would feel beyond rude to just sit there silently and stare like I was on the set of Jerry Springer. But it's not my house and I'm not very comfortable there - if I quietly slipped out to another room, what would I do there? It's hard to describe the set-up of the house, but it's quite small so what would happen would be me, standing awkwardly doing nothing, listening to the argument from another room. Should I pretend like I don't notice there's an argument going on and act like I'm watching TV? Pretend to be super interested in my phone?
(And I know I will likely not get replies before dinner, but I'm very interested to hear advice/suggestions anyways as this may happen again!)