My sister in law is Power of Attorney for her mother. Her mother now wished she had made my husband (her son) the POA, but she has now been diagnosed with dementia. My sister in law lives out of state and wants to go back home leaving us with the care of her mother. It will be hard to handle things with her still as POA. Are there any legal actions that we can take to get the POA.
Just being POA for your grandparents does not give you aunt the right to sell their home if one or both of them are still competent. Is your grandmother still competent.
Is your grandmother healthy enough to stay in her house?
If your aunt does sell their house because grandmother is not competent, that money can only be used for her care legally speaking or if she ever needs medicaid they will want to know where all of that money went.
If your aunt is in this for the money, she will be breaking the law as your grandparents' POA.
Are your parent's up to date about this situation?
Your removal from the DPOA seems to have been out of order, and everything your sister did thereafter using a new instrument was therefore done under false pretences.
Now "all" you have to do is prove it. Do you have access to reliable, cautious legal advice?