A family member has been renting out my house for all last year and I have been paying the rent

 If you own the house, it's impossible for "you" to pay rent to yourself to live in the house you own. Likewise, you can't be paying rent to yourself for someone else to live in a house you own either. That's taking money out of your left pocket that you've already paid taxes on, and putting it in your right pocket so you can pay taxes on that same money again. So can you provide a bit more insight please? Your statement as worded just doesn't make sense.