I really think I need to tell my brother-in-law and friend to stop focusing on my daughter so much. It's ruining our friendship and my wife's relationship with her sister.
Oh, I see. What exactly is he focusing on your daughter for?
He's very arrogant and says things to her that makes everyone uncomfortable.
Setting boundaries to protect your family is okay. If someone makes you feel uncomfortable due to their interactions with your family members, let them know privately. They're less likely to become up and may even be willing to change their behavior.
Ok, thanks for your input. I'm going to do it.
Great! You deserve to have the boundaries of your family relationship respected.