I'm so sorry to read that your daddy is having a difficult time again. I am praying for all of you and your family.
Know that while your husband may have tried to cut those emotional ties to your daddy, he still on some level must have somewhat of a connection to him and be concerned, even if he isn't showing it. It's so hard to mind read a person who is going through MLC, so don't even begin to try...but know that there is probably some concern there.
I will say that during each of my 3 separations, I went through some very difficult times on my own (taking my youngest who was seriously ill to the ER on my own followed by my own serious illness which I suffered through while taking care of 4 kids on my own, family members dying, etc), and my H wasn't there at all. Now that he has come out of his fog, I've had to work very hard to put those times behind me and forgive. Either way, as I encountered each obstacle, I learned how much I could endure on my own. I see this happening in you, as well.