foreclosure question

My parents filed b/k back in late 2012 and there home was included with the b/k. The IRS put a lien on the home around the same time for some back income taxes. My folks moved out of the home in May of 2013.

Fast forward 2 1/2 years... The house is still the way they left it. Property preservation has winterized the home and do periodic checks of the property but other then that its just sitting there.

The loan was through Wells Fargo, and I believe there loan fell into the mortgage fraud suit category.

So my question is can I move into the property until it actually goes through foreclosure without any serious financial consequences? The home is seriously underwater and I don't want to accidently somehow reaffirm that loan. I called Wells Fargo and they said the loan is only in default and not in foreclosure so its up to us if we want to live there or not.

My house just sold and the one I was going to roll into the sellers backed out. So I'm kind of in a spot

Any advice would be appreciated