Open Question: How to manage time with my mother's cancer...?

My mother was recently diagnosed with breast cancer and has been undergoing chemotherapy. She doesn't have her drivers license and she lives at home (she is a widow as my father passed away 9 years ago) with my older sister. I also have a twin sister, so it's basically the 3 of us who will need to take care of her. I am 24 as well as my twin and my older sister is 38. We all work 9-5 jobs