Neighbor Drama Power Of Attorney

So my neighbor was recently incapacitated because of a hiking incident. He's 36 years old, married with 1 child. His insane mother had him sign a POA in his late teens that granted her financial and medical control.

They haven't been in contact in 12+ years but she's suddenly throwing POA rights in everyone's face at the hospital and she has the documentation.

It's a nightmare because the original POA wasn't revoked properly years ago. Wife stated he said it was revoked but the paperwork wasn't notarized.

Anyway, the wife is trying to fight it. The only other thing she has is a video the husband made of himself explicitly stating his mother should never have the ability to control his affairs in any capacity if he's incapacitated. This video is maybe 5 years after the POA was signed. Could a court take that into consideration and make the decision to revoke it?

This situation has caused me to get serious about my own POA that I signed years ago. I barely know the person now.