What do you do if your in love with your best friends brother?

Tell him you think youre starting to grow some feelings for this guy, but you dont want to hurt anyone or make the situation uncomfortable. See how he reacts and just talk openly and honestly with him. You dont need to know exactly how you feel or what you want, just tell him whats going on in your head.

How do I approach my friends sister?

Ask her out.Acknowledge that the situation is strange. The sister might be uncomfortable with the idea at first. You could say, “I know its weird because Im Brians friend. Let her know that you have talked to her sibling about it. If she doesnt seem interested, let it go and move on.