We were having a family reunion and my brother-in-law was staying in the hotel room behind mine. And I assumed his girlfriend was in a separate room, but then during the night I thought I heard some moaning in there, and the bed shaking and hitting the wall of my room.
And ****, he knew where my ******* room was. He probably knew I could hear and isn't even concerned about this for some reason... Should I be concerned?
He's 23.

