Just ignore it, doesn't really matter.
Some years ago I was with a French girl, staying with her family in France. Besides being surprised that they were cool with me sleeping in her bed from night one instead of the spare room I was told would be ready for me, I was also surprised to see her brothers Italian guy "friend" stay over and hear the bed squeaking for a couple hours that first night. I would have preferred not to have heard that, but besides that it didn't make a difference in the long run.
Just do your thing, treat him like you'd treat any other dude until or unless there is a reason not to.
Some years ago I was with a French girl, staying with her family in France. Besides being surprised that they were cool with me sleeping in her bed from night one instead of the spare room I was told would be ready for me, I was also surprised to see her brothers Italian guy "friend" stay over and hear the bed squeaking for a couple hours that first night. I would have preferred not to have heard that, but besides that it didn't make a difference in the long run.
Just do your thing, treat him like you'd treat any other dude until or unless there is a reason not to.
Americans are dreamers too