Do u and your sis/bro have the same freind(s)? How does that work out?

Me and my younger sis Sara have a few of the same freinds. Saras 15 and I'm 17 some of r closest freinds we met at youth group. So we hang out with the same girls from there expecally Brea, well Brea is both of our best friends but me and Sara don't get along so it's ethier Sara and Brea hangin out or me and Brea. This isn't working out? Any thing simaler with your sibs? Wat to do?