If you can get your grandfather to speak to a solicitor, on his own, without any of you present, on one of his lucid days, where he would admit that he freely gave all this money but hasn’t got a clue how much it was but it was a substantial amount, that would be fantastic. I would keep that information that the solicitor would have on file in reserve in case there are ever any court proceedings.
My suggestion would then to be simply ignore everything they complain about and are saying and if they feel so strongly about this, let them issue legal proceedings. If they continue to bombard you with emails and phone calls, simply ask them to stop, and if they don’t stop, call the police and ask the police to warn them under the Protection from Harassment Act. They cannot simply keep bombarding you with accusations. They either have to issue proceedings or shut up.
Alternatively, the solicitor can write to them telling them of his findings when he met your grandfather and that he was quite lucid and clearly understood everything that had gone on and there is no allegation of undue influence.
At this stage in time, what the complainants would be looking at is an allegation of abuse of a vulnerable adult if someone was getting grandfather to pay the money and he either didn’t know what he was doing or pressure was being put on him to do so. If someone took money from the account, without grandfather’s consent, then it’s theft. I appreciate none of that applies here but I’m just telling you what the allegations actually are. They are both police issues although the complainants would probably be better starting with social services. I’m letting you have this for your own information of course.
Can I clarify anything for you?
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We can still exchange emails if you wish.
PS. Invite them to come and see grandfather on his own and then he can tell them in his own words.