I feel these are pivotal documents to have in place which is why I was looking to complete these myself as I certainly could not pay the sort of money solicitor's are looking for their services in respect of these legal documents.
I'm also finding it confusing about why and what to ask of people who have known my Dad in this condition for two years and are prepared to be witnesses to these documents?
As a single father with two children, the whole saga is deeply stressful and I'm hoping to find support in this community. Our lives have been turned around in a week and whilst I do not want to blame my sister or the manner in how I've ended up in this situation, I'm desperately despairing over what I need to do as I'm finding more and more that things my sister told us (the wider family) were in place, are in not. Are LPA's the first thing I should be getting in place whilst I wait for the so-called helpful agencies to respond.
I would definitely put in place LPA's - financial and health and welfare.
As far as I am aware, the only relevance your dad's mental state has is that he needs to be able to understand what he is signing and what the LPA's do. The only requirement is that he understands them at that point - it doesn't matter if he becomes confused about them later on. Memory is virtually irrelevent, so it wouldn't matter if he forgot about them a minute later.
Again, as far as I am aware, the witnesses simply attest that the donor (your dad) understands what he is doing and is not under any undue influence or pressure whilst doing so.
It does not have to be a legal or medical professional. Only someone who knows him well enough to make a reasonably informed judgement about this.
LPA's are designed to be created by a layerperson, although many elect to go through a solicitor. You might "shop around" and get some quotes; a small outfit often charges a lot less than the ones on the fancy buildings. You can go to any solicitor you like, it doesn't have to be you "family" one.
A solicitor would ensure that their client (your dad) had passed the capacity and influence requirements - usually by simply interviewing the client on their own. If there is doubt about capacity then they might ask for evidence from a medical professional. But again it is down to the judgement of the solicitor.
Having said all this, an LPA would usually only be questioned if someone challenged it - usually during the registration process. AFAIK, the Court of Protection does not routinely or randomly challenge an LPA. They would simply ensure that the LPA was correctly filled in, witnessed, etc. So long as it is, there shouldn't be a problem.