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I am sorry to hear about this situation. On this website, I do not always get to give good news, and this is one of these times.
Wisconsin (under Chapter 704 - landlord/tenant law) does not allow the landlord to break the lease early to have a relative live on the property. As long as the tenant continues paying and otherwise does not breach the lease materially, the landlord (i.e. you) cannot breach the lease, either. So it is not possible to oust the tenant earlier unless the tenant agrees to leave earlier.
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