Get a copy of the death certificate and send the entities you are concerned about a copy with a letter.

The very same way you get one in any circumstance. Bring the document, their lawyer and a notary. You will have to find out from the prison how...

Contact the vital statistics dept of the State she was born in.

I doubt it is valid. A minor really can't consent to POA.

The administrator/executor of the estate would have to take care of it.

POA ends with the person's death. So POA is no longer in effect. The executor/administrator of the estate will have to evict her on behalf of the...

There is no way to make a comprehensive list. It has to be pretty bad though.

Call CPS as soon as your granddaughter lets you know about the abuse. In states where corporal punishment is not illegal, using an implement and...

You need to call APS on your mother for abusing your grandmother.

You get the death certificate from the state he died in. Send them a letter/email and payment and tell them it is for his child. Provide proof.