My Grandpa Riga had dementia and stayed in a nursing home. He had an equally senile room mate. The family of the man came every month and gave him $20 for a little spending money. Every month he was always broke.
This went on for a while until finally they filed a complaint and began to accuse the staff of stealing. An investigation was conducted and it turns out that my grandfather was charging his roomie $20/month rent to stay in his
room. The money was found neatly stacked in his bedside drawer. We thought it was amusing. They did not.