My sister took the half of my birthday gift?

My brother in law gave me a $100 bill as a birthday gift and he gave it to my sister to give it to me. My sister took the $50 bill and gave me the other $50 and she's furious because its a $100 bill and I felt like I dont deserve it. I thanked her. Now my brother in law pmed me on facebook if I got my birthday gift from him should I say I only got $50 and not $100?
My sister took the half of my birthday gift?
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