OP, I'm sorry to hear about your mum. I really hope that the treatment works and that she recovers.
My dad had cancer when my mum was pregnant with me so I didn't have to experience the trauma of nursing him through it, but I have, of course, seen the effect it had on him since and I know it's not easy.
Last year I also found out that I have a hereditary gene which means that I have >80% risk of getting cancer and when I turn 25, they will start screening me for it. This makes me lucky in a way as it means there is more chance they will catch it early, but it sometimes feels like I have a death sentence hanging over me. Anyone else in a similar position?