The solicitor is wrong that lack of capacity has to be proven by a social worker of medical person. The law doesn't say that at all. He is most probably wanting proof to protect himself from any possible liability, which is perhaps understandable.
The solicitor cannot ascertain capacity by telephone. That would be wholly inadequate and we all know that people with dementia can put on a good act for a short time.
What the solicitor cannot know, and nobody knows, is whether your brother has done anything wrong. There are a number of possibilities that are unpleasant to think of but that have happened before to people:
1) He has spent the money for his own benefit, maybe holidays, wild women, and a very nice car. I am not saying this is likely.
2) He is simply conserving her money to maximise his inheritance. More common I should think.
3) Her is embarrassed about her finances, perhaps he invested her money honestly but unwisely and has lost it.
It seems pretty clear that your brother has something to hide, unfortunately. I am afraid I think that as a second attorney you do have a responsibility to find out what it is, otherise you could be critisised yourself for failing to take action.
I agree with @Violet Jane that he is failing in his duty as an attorney if he does not provide her with care that she needs and that she can afford. We don't know for sure what she can afford but plainly she needs better care than she receives and if it is true that she has substantial funds then these need to be used for her benefit in old age. This would be your grounds for a complaint to the OPG - it is the thing you can prove, whereas any suggestion that he has shut you out of her finances because of whatever it is that he is hiding, is just speculation at the moment.
The solicitor cannot ascertain capacity by telephone. That would be wholly inadequate and we all know that people with dementia can put on a good act for a short time.
What the solicitor cannot know, and nobody knows, is whether your brother has done anything wrong. There are a number of possibilities that are unpleasant to think of but that have happened before to people:
1) He has spent the money for his own benefit, maybe holidays, wild women, and a very nice car. I am not saying this is likely.
2) He is simply conserving her money to maximise his inheritance. More common I should think.
3) Her is embarrassed about her finances, perhaps he invested her money honestly but unwisely and has lost it.
It seems pretty clear that your brother has something to hide, unfortunately. I am afraid I think that as a second attorney you do have a responsibility to find out what it is, otherise you could be critisised yourself for failing to take action.
I agree with @Violet Jane that he is failing in his duty as an attorney if he does not provide her with care that she needs and that she can afford. We don't know for sure what she can afford but plainly she needs better care than she receives and if it is true that she has substantial funds then these need to be used for her benefit in old age. This would be your grounds for a complaint to the OPG - it is the thing you can prove, whereas any suggestion that he has shut you out of her finances because of whatever it is that he is hiding, is just speculation at the moment.