Unfortunately spike, it your father did not fully realise what was happening due to his medication etc., your daughter may have pulled a fast one from what you say. I don't know when this happened but I guess that it was before the Mental Capacity Act came in, when the solicitor would not have let your father sign if he felt he did not understand what was going on. You need to take your own independent legal advice, now, before this drags on, if you are to stand any chance of getting what your father wanted.