Living with triplets

I said in reply to a comment on one of the posts the other day that living with someone who has dementia is a little like living with twins but I've decided it's more like living with identical triplets - they look exactly alike but each has their own personality. You begin with the nicest one and live a long and happy life but then your other half starts to change places with one or other of his two siblings. The swaps happen infrequently at first and in short bursts so things just seem a little off but it's nothing you can put your finger on. Then the swaps become more frequent and you know something isn't right but, because he/she doesn't always swap with the same sibling, each time it happens the reactions are different and you're not sure what just happened. Eventually however your life partner, your best friend and the corner stone of your life, fades into the background leaving his two siblings to take it in turns to switch places. The problem here i...