There is a lot of good tech advice. I went through a similar situation and approached it from more a legal/financial angle. It depends on where you live as ea

There is a lot of good tech advice. I went through a similar situation and approached it from more a legal/financial angle. It depends on where you live as each country & state is different. Where I live in the US, it is relatively easy to get financial and medical power of attorney; you only need a notary or three witnesses. With financial power of attorney, an agent has the ability to e.g., sell your father's house, transfer funds etc. What I did was (a) got financial & medical power of attorney (b) got my father's long time doctor to provide me a Letter of (in)Competency which states my father cannot make financial/medical decisions on his own. That letter is ammunition for me, if I have to fight a scammer who somehow tricked my father to assign financial power of attorney to them. (c) I also had several discussions with my father's priest so in the worst case scenario, I can rely on my father's doctor and priest as witnesses if I have to go court, file legal motions, etc. What this experience taught me, is that when it is my turn to become senile, the best strategy is to transfer my assets before hand as much as possible. So that the damage scammers can do is minimized.