The buyer has the signature on paper and can proceed with taking the house.
The person who just sold their house _could_ contest it in court... except that they're not mentally competent so by definition they won't be able to mount a defense (i.e., realize that they just got scammed, hire a lawyer, put together a strategy, etc, etc). Brilliant!
If the elderly, mentally incompetent person has _someone_else_ in their life who notices this early and jumps in to clock a lot of hours to stop this from happening, then sure - everything will be fine.
The buyer has the signature on paper and can proceed with taking the house.
The person who just sold their house _could_ contest it in court... except that they're not mentally competent so by definition they won't be able to mount a defense (i.e., realize that they just got scammed, hire a lawyer, put together a strategy, etc, etc). Brilliant!
If the elderly, mentally incompetent person has _someone_else_ in their life who notices this early and jumps in to clock a lot of hours to stop this from happening, then sure - everything will be fine.
If not, well, the bad guys win.