What would you do if your sister was assaulted by your cousin?

Anonymous
My best friend's sister was assaulted by her cousin. She didn't even say a word about that to anyone, but later on, I found that in her diary. I asked her what happened, and she said everything. Actually, we have been close for 13 years, and that hurts me a lot. I don't have any siblings, so I do care about her, just like mine. She doesn't want her parents to know this.
What would you do if your sister was assaulted by your cousin?
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