They intuitively sense when they need to be of comfort.
When I was growing up, our family had a male cat that was not overly lovey-dovey. It was always a treat when he would occasionally allow us to hold him. But whenever one of us kids were sick with some childhood flu or virus, he'd hang out with us in our bedrooms for hours. Usually at the bottom of our beds, which always seemed to make everything better. My mother always used to say that everything would be alright, and that we'd feel better soon, because 'Nurse Tom' was there. 
My condolences to you bamademo. Watching your mother fade away must be very hard. I'm glad though, that your rescue kitty knows how much she means to you. It is his way of thanking you for being so good to him, while comforting your mother at the same time. 
Edit history
Recommendations
0 members have recommended this reply (displayed in chronological order):
= new reply since forum marked as read