My sister negated our dual Power Of Attorney and became Mom's legal guardian. She is making decisions that my mom doesn't agree with. How can stop this?

PAM:

Looks like obtaining guardianship was the only way she could override your POA and be in charge of it all. I also suggest you get an attorney to set up a durable POA that spells out your rights, responsibilities, and limits. And while you're at it, see if you can have a living will drawn up for the family. Both these suggestions will send your sister into a hissy fit, but clearly she has other plans that don't include you. Take care of the paperwork first, then you'll be able to negotiate the long-standing friction between both of you on an even keel and reach a workable compromise. ... At least while your mother is alive.

-- ED

How did your sister negate your POA? You may want to see an elder attorney about this. Something doesn't seem right here.
Carol