Should I still keep this appointment?

My dad was diagnosed just two weeks ago with aggressive Non Hodgkin's Lymphoma. It's fast growing and if you are compromised, the doctor does not want to do chemo Bec it is often fatal..even low dose. But he had told us two weeks ago maybe another doctor would do it. To get a second opinion if we wanted. So I got another doctor opinion, but at the same hospital. He was more experienced and also said, in more cases than not the chemo will kill the patient before they just went naturally.

My sister thought we should get a third opinion from a separate facility. (Our family member is a oncology doctor and she believes he would possibly have the cancer controlled on low dose, even being compromised. She also said get another opinion)

We have a video call in three days, it took a week to set it up. But now my dad's getting worse, he's moved from the hospital into hospice two days ago. Just two days ago he was pretty alert and only rested a bit. Today he's been asleep my whole visit and very abrasive, refusing any drink or food. Saying let me rest. He's never ever acted this way. He's getting more fatigued from the cancer. Do I keep the third opinion appointment? My sister says yes it took her a while just to register him at a different facility. But I am 99 percent certain it will be no chemo, as an opinion. He has still fluid in lungs and can barely stay awake. What do you think?