Hopscotch - I am also in Australia and I have the office of Adult Guardian onto it - they said there are red flags all over it! But in the end I do not know how effective they will be. After seeing how it goes with them I will use my own legal representative, however, I have a feeling that the boys at Bethel are operating in their usual way. They are not waiting for my mother to die so I can contest the will - they want it done first and then it would be too expensive for me to fight them. My interest is not in the money (will) anyway, but having some control over her money to see she gets the ongoing care she needs, so if all the money is spent - so much the better. Unfortunately my mother - as well as having dementia - is brainwashed from long ago and sounds just like the OP's father.
LV101 - I was the guardian with her consent but the local elders got her to re sign for them. One morning she showed me a piece of paper and didn't know why she had to sign more papers at the bank. The alarm went off and I rang the bank. The bank manager told me she was not happy about the 2 men who came in with her to sign and asked me if they are family member...one I know a little (and anyone from Ausrt would be quite surprised to know who it is) and the other I have never met....but he is my mother's power of attorney :-) Not even the manners to make a phone call. Changed the locks that day so I couldn't continue to stay at her house and installed a watch-dog - a sister whom I had never met but gave me the distinct feeling she had 'been around'.
There is a lot more to this that I will make known when a conclusion is reached - but suffice to say that there has been some very dodgy and outright dishonest goings on - and one from a legal representative at Bethel. Interestingly, the various doctors, counsellors and the office of Adult Guardian have not been at all surprised - quite the opposite - when they know who the religious group is that they are dealing with.