The story of John Wilcox demonstrates how, in handing over responsibility for their financial assets, vulnerable people can sometimes be put at risk by members of their own family.
After many years of running a successful office-furnishing business in Leeds, John and Barbara Wilcox had retired and were living comfortably in mid-Wales.
Both had been married before. John had no children of his own, but he loved Barbara's son and daughter as his own, as well as her three grandchildren. To each of these, he had given enough money to buy their first homes.
However, everything changed in 2020 when John was diagnosed with dementia.
The condition caused a personality change, and John became delusional and paranoid. He started to accuse Barbara and his own brother Desmond of plotting against him.
Following a collapse at home John was taken to hospital, where - because of Covid restrictions - nobody was allowed to visit.
This isolation fed John's feelings of paranoia, and the suspicion that he had been abandoned by his family.
It was during this time that John's eldest granddaughter, Amy - the one person he still seemed to trust - began to take charge of his life.
At first, no-one in the family was suspicious. John had always been close to Amy.
Unknown to them, John had requested and signed a form banning contact between anyone involved in his care and anyone in his family, apart from Amy.
Even though his medical notes describe him as paranoid and delusional, John was declared as having "mental capacity" - this was significant because it meant he could legally grant someone lasting power of attorney over his finances.
Barbara says her efforts to raise concerns with social services were blanked: "They just didn't want to know. They weren't interested in the letters that we wrote."