Is it possible for my cat to miss her old owner?

She has warmed up to us nicely, I assume she was just a friendly cat to begin with.
He hadn't been home for a couple of days when we got her, he was on vacation, so his son and daughter in-law gave us the cat. He authorized the decision.
Anyway, I guess she used to always sit on his lap and would always be with him. He was recently diagnosed with cancer and couldn't take of the cat.
Is it possible she misses him? I felt bad taking her from him, but it's what would have to be done eventually.