What would you do if a family member went through your stuff without asking first?

I was visiting relative I don't really know well. The house hold went to the mall with me. I paid for my own items and I was not with them while in the mall. We all leave the mall and while my cousin and I are away our bags have been opened and looked threw. Im a bit ocd so I had things organized a certain way. I later asked all those there if anyone went threw my stuff and what the reason behind it was. What would your reaction be to this happening?