Thank you. In WI, any property shown to have been acquired by either party prior to or during the course of the marriage in any of the following ways shall be considered that spouse's separate property:
1. As a gift from a person other than the other party;
2. By reason of the death of another, including, but not limited to, life insurance proceeds; payments made under a deferred employment benefit plan, or an individual retirement account; and property acquired by right of survivorship, by a trust distribution, by bequest or inheritance or by a payable on death or a transfer on death arrangement;
3. With funds acquired in one of the two manners above.
-From 767.255 of the Wisconsin Statutes.
Now, a spouse can argue that he or she had some equity in the other spouse's separate property if that spouse performed maintenance on the separate property or helped with the upkeep on the property. Unless there was some major renovation going on, it is likley that the court will not award the spouse any equity in your home or may award a nominal amount. If you have any more questions, I will be happy to answer them. Please accept my answer so I can receive credit for helping you. We can continue our conversation at no additional charge. Thanks!