Can I file bankruptcy in my name if the house is not in my name so that I can save it?

A bankruptcy in your name won't save the house from foreclosure. That would have required paying the mortgage over the past few years. You've lived there for free for over a year, did you really think that you are entitled to a free house forever? Hopefully, you've saved up a bit while you were on gravy train (as if!). Better get used to the idea of a monthly rent payment.

I very much sympathise with your situation. Judging from the facts you state, however, the question is stale since apparently the sheriff's sale took place. But your grandmother's rights in the house, under the law of Wisconsin, only end when the judge enters an order confirming the sale. That hearing is usually about ten days to four weeks after the sheriff sale. A personal bankruptcy will not likely help you, since the debt is not yours. A decedent's estate is generally limited to dealing with debts in probate. If you could solicit a serious offer on the property before the confirmation of sale, you could come in and ask for more time to sell the property before the sale is closed. Consult the estate's lawyer. If there is none, consult a skilled real estate lawyer WITHOUT DELAY. There are sometimes other grounds for opposing confirmation of sale. Good Luck.