My ex MIL has dementia. Her daughter and husband (not the DD's Dad) have joint POA (not severally). They cannot work together.
I am in the middle of them complaining about each other.
They have wildly different opinions on what's best for MIL.
I'm so sad for MIL and so annoyed and frustrated with the two of them.
Things will get to a stage where decisions will be taken out of their hands and neither of them will have a day in MIL's care.
Fortunately SIL has a super DH who is the voice of reason. Maybe between him and me we can calm things down.