family sharing issue

A friend of mine who is linked to family sharing made an in app purchease using his credit card. However, the amount also came out of my bank account

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I've gotten money back for ITunes purchases before. If you go into your purchases on the computer or in ITunes and put that you did not mean to buy the item, you write down a little explanation and you will be redeemed. I don’t know how this works with family sharing and if this would remove it on the other person’s end or not but I wouldn’t think so.