I don't want the brother who molested me home for christmas
That's reasonable. Why is he coming home for Christmas?
My parents may forgive him and welcome him, I don't think he deserves to be forgiven
You are under no obligation to forgive people who hurt you, especially something so violent and traumatizing as this. If your parents don't understand that, then it might be better to find a new place to feel welcomed and safe for Christmas.
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It sounds like you need to really speak to your parents about this if its bothering you. You deserve to have your feelings taken into account since you were the victim of the crime. Your parents need to prioritize helping you first over your brother.