The extended family went to a basketball game last night. My BIL got into a bit of a tiff with my future SIL. My SIL is very fired up about his sports teams, so he was yelling and cheering and let slip a couple of f-bombs and "Jesus Christ!". I wasn't really paying attention to him and it was loud as fuck, so I missed the whole "confrontation". My BIL asked him to tone down the language, as we had an 8 year old there, plus my very churchy MIL. SIL declined to tone it down and instead left. He later texted my wife to say he left to avoid causing a scene, but he felt my BIL should have spoken to him more discreetly. As I said, I missed all of this, I was watching the game and looking at my phone.
Of course, this is the year that we host the Christmas gathering, so both of the offended parties will be at my house tomorrow. I think they both need to just STFU and forget it ever happened but that would be too easy.