It is important to keep an eye on your older relatives and their finances. I had a cousin pass away about two weeks ago and she had suffered from dementia for a couple of years. At the wake I learned she had been scammed by telephone three times and had lost all of the money she had spent a lifetime earning. Sad story.
Regarding phone scams, on a lighter note: If you have not heard the Tom Mabe phone prank call it will make you chuckle.
https://www.youtube.com/watch?v=ttrzG5F4R3o