hmm, i do see how that could be a problem. but if u really like this guy, address the situation with your best friend. tell her how you feel towards her brother, and ask how she would feel about you possibly dating him. or better yet, FIRST ask how she would feel if one of her friends dated her brother, and then see how she feels.

and it’d prolly be a good idea for you and your best friend to promise to each other that no matter what happens between you and her brother, you’ll still be best friends and it won’t change anything😌

i’m just saying what i think i would do, so i hope maybe that helped you think a bit?