My sister STILL TATTLES on me???!?

Talk about it with with your mother. Just say "Mom, (sister's name) can't keep coming with me to places. I love her and I always will, but frankly I can't stand her. She gets on my nerves, she is my sister and nothing more. I talk to my friends about stuff that I can't with her. Plus my friends aren't her friends. She needs to get her own life and she can't do that if you force me to take her places. Were not going to be there for each other forever. She needs to be independent. You understand?"