Trusting, I have to agree that you need to keep the focus on you and your family. I understand the concern you are voicing. It could be any number of things going on, but the one thing that appears to be evident is that he is depressed and severe depression can create so much crazy behavior and yes, it does affect the memory.
Please try not to worry too much about what is going on. He could have been having a very bad day and their lack of concentration does take over when their brains are on overload.
Please plan to do something special for yourself this weekend. You deserve it!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.