I was in the car a few nights ago with FI, his 15yo daughter, and her best friend. My shower, which is being hosted by MOH, future MIL & future SIL, is in 10 days.
15yo asks, can my best friend come with me to your shower. I reply that we will talk about it later, thinking it is rude to have the discussion in front of her friend. When they get out, FI asks why I didn't just say yes. I explained that I was not hosting and couldn't just arbitrarily add another person (it is a very small 12-15 people) shower and more importantly... it isn't appropriate for her to bring a friend. He thought that was ludicrous... and plainly told me so.
Was I out of line?
As James so eloquently states - Nothing Else Matters!