This kind of behavior is so hard for me to believe people are capable of, even though I know it happens.
Through the years my dad was sick, after my mother's death, I spent most of my time and energy protecting him and his assets. Even after his death I was still in protective mode for months.
The people who do this stuff rationalize it by saying that Grandma's money is "their inheritance" or that they deserve it because they have done so much for Grandma. And it is a very, very common occurrence.
Hmmmm.......You think relatives stealing from the elderly is bad, you need to check out the California probate courts and the Attorneys that practice in them. Wholesale theft and abuse of the elderly. I know of a women with advanced Alzheimers that was put in a man's bed and he was allowed to have sex with her. The court doesn't want to hear about it despite an abundance of evidence and the San Diego prosecutor won't prosecute.