It's incredibly hard to see our loved ones become people we no longer recognise and we are grieving for the people they once were. I still love my Mum even though she's not the same person any more. I remember her as being a very strong-minded, intelligent, independent, feisty Irish woman with a lot of interests and now she's very confused, is living in a care home and has no interests at all. When we visit, she repeats the same stories over and over again and it's incredibly hard and sad to be with her.
However, there are still glimpses of the old Mum and the last time we were there we were talking about my OH's 60th birthday which was last May. Mum said "did I forget your birthday?" and my OH said "yes but don't worry about it". She then said "well I do remember everyone's birthdays but just not at the right time!" and we all fell about laughing. She always had a good sense of humour and that's the one thing she hasn't lost yet.
We have to accept that our loved ones have this terrible illness that turns them into shadows of their former selves but they are still there, the memories of what they once were are still there and there are these little moments of humour that we have to treasure as we face the future.
You are not alone. I am sure we all feel the same way and the beauty of this forum is that you can say what you want without feeling guilty or feeling you will be judged in any way. It's not easy but you care and that's the most important thing.