Yes Lavalamp, Anesthesia is especially known for bad effects on the elderly making their thoughts very distorted and often extremely angry. And it last for up to 6 months in the system.
And it is one of the reasons why they hesitate on performing surgery on the elderly.

I had to witness seeing my mother struggle for months being totally confused.

I also had such a hard time in my own recovery. It was especially hard for me because I had two surgeries withing 10 days. I was also on the table for a long time, hours during my life saving surgery. I had a tube down my throat and I can no longer sing because of it, but at least I can talk. And I never realized that when you are opened up, air gets trapped in the body and it too is very painful.

No, I had to find out later, and they should have prepared us for how my mother was going to behave after her surgery. Some can be extremely hostile.

I don't know if you had surgery or your father did, but it does take time, anethesia stays in the system for months.

Open Eyes