Should I address my mom's selfishness because she isn't the center of attention right now?

Hi all! In January I brought my dad to the emergency room for severe abdominal pain which turned out to be cancer. It was removed but his extremely frail kidneys failed with the surgery, anesthesia, pain medication, etc. We were all aware of the possibility of it, but he wanted to go through with the surgery. No cancer! It was all removed, but now he is on dialysis. He's gone from a strong willed assertive person to just a small depressed shell of a man. And frankly I've been angry about. My narcissistic mom who has arthritis hasn't been getting the attention she essentially demands through this whole process and has been much more dramatic lately. Anytime someone mentions their issue she makes sure they know her pain is 10 times worse than their's. It never dawned on my that she was affecting my dad's wellbeing, as he has been healthy his entire life, and he has been an amazing patient husband to her. Now that he's the one that needs a little extra help and attention she seems to really be grumpy and sometimes mean to him. I said all of that to say this. I was folding laundry this evening for them and I heard my sweet little frail dad tell Jesus to bring him home because his wife doesn't care about him anymore!!!! My heart absolutely broke. I wanted to run in there and scoop him up and tell him I loved him, but he would have been beyond embarrassed! My mom isn't someone you can address and tell her she hurt someone's feelings. She will blatantly deny it and when she's all finished it was their fault, no matter the issue! Also stuck, because my dad grew up in an era where men swallowed their feelings. That isn't something you discuss. Period. He doesn't ever hardly tell anyone he loves them. He shows it, but doesn't say it. So....that's my plight and I think I just needed to vent. Thanks!