A lawyer was brought to a previous rehab and my dad was told to sign some papers. As per my dad, he wasn't sure why but he did. Right after that he was moved into what we thought was an assisted living facility but was not, his condo was sold he has no idea for how much and he didn't get any of his stuff moved not even his wedding pictures. We were told our 2 brothers had the move covered. Only to learn the neighbors saw them throwing bags of stuff into the dumpster.
There are two types of POAs. Immediate and Springing. Immediate means just that, that your brother could immediately be in charge of Dads finances. Springing means Dad needs to be declared incompetent before the POA kicks in. Either way, the POA has no right to spend Dads money on anyone but Dad. If Dad is asking questions about his finances, the POA is obligated to give him that info. Selling the Condo? That depends on how the POA reads. My Moms read I could sell her house but my POA was springing so she had to be incompetent to make that choice.
You need to get a copy of that POA from the lawyer who drew it up. And that lawyer should have made sure Dad understood what was going on and that he wasn't being cohearsed.
If it was your Dad, it could be a case where Dad is having memory issues, and it is not unusual for someone to stretch a story or even make up one.
If it was the neighbors, who told them? Your Dad?
When was the last time your visited your Dad? When was the last time you helped one on one to care for your Dad? If it has been awhile, it could be his memory isn't as clear as it use to be.
When my Dad move to senior living, it was his suggestion, he had me sell the house and get rid of anything he didn't take to his Assisted Living. Believe me, there were tons of trash bags going to the curb every week. Donations trucks. Us hauling smaller items to Goodwill. Dad also wasn't one to have many personal photos around, he only wanted the one favorite photo of my Mom.
Curious why you or your sister aren't in good communication with your brothers? Sounds like you and your sister weren't there to help Dad move. This should have been a team effort. Were your brothers doing most of the caring for Dad? If so, I can see why they went ahead with whatever was the next step to care for Dad.
Again, more information would be great.