Get up in their face and confront her/him about it ! Most of the time when you confront someone for stealing and they know you know about it, it will stop! Best thing to do is talk to your cousin as soon as possible and end this problem.
Lily UniverseFox
I am a girl who loves dogs, dragons, and FNAF. I have a really annoying cousin who is my age, and she is always trying to top me or embarrass me. Even though she fails every single time. I will need the most help with her.