So, what happens if you live and die in Wisconsin without a will? First, it is called intestate. Second, upon your death, state statutes will control the distribution of your probate property. I've put a link to Wisconsin's intestate succession chart on my pratice's web site.
What does this mean? If you are not legally married and have no children or grandchildren and you die? If your parent(s) survives you, they will inherit your probate estate. If not them, then equally between the next layer of relative. This means that any partner you may have would not receive a thing of probate property.
Estate planning isn't fun, but it is about taking control.