Nora knew that Brenda was a cancer survivor before she and Damien met. She also knew that Damien did everything he could to extend the life of the only family he had left. But she never knew how Damien did that.
Obviously, Brenda doesn't know about what Damien did as well. Brenda held Damien in such high regard. To her, Damien is an angel that was brought to her. She always tells Nora that she owes her life to her grandson.
The old woman was oblivious to what Damien had to choose to extend her life in return. If Brenda is to know, she would definitely be heartbroken.
"I have my choice but I choose the position he gave me. He valued me. He valued my words. Treated me the way my biological father should've treated me. But they have one thing in common that I hated the most,"