Hi and welcome to TP. I'm glad you have found the forum.
Has your father had a diagnosis yet? If not then I think your first step should be to take him to his GP. There might be other reasons for your father losing confidence or his poor memory but you won't know unless you seek a diagnosis. Once you know what you're dealing with you can make plans and perhaps there will be medication available for your dad. You might find the links on this page useful -
One thing that strikes me is the importance of getting power of attorney (finance and health) organised if you haven't already done this. This fact sheet may be of interest -