Glad you started reading it. I bought/read it last summer when my mom was in the middle of a health crisis (eventually confirmed to be caused by a failed valve replacement, leading to congestive heart failure). My sister also read it at that time. We both cried a lot, but it helped us navigate important parts of the journey, including calling in palliative care for a consult during one of my mom's hospitalizations, getting her to sign a POLST, and setting up a visit with hospice after she went home. Her condition has stabilized since last fall, and she isn't eligible for hospice yet, but we know who to call when she is ready. And we were also able to have frank discussions with her about her wishes for end of life care.
Hard stuff, but it does really help to have books like this to reflect on as you are going through it.
Hope you have good conversations with your parents during your visit.