First, mom is responding well to treatment. They believe she has bacterial pneumonia, is on 2 types of antibiotics and receiving supplemental oxygen. They've been successfully slowly weaning her off the oxygen, but as of last night she still needed some. We've had to change flights, hotels, etc. It's expensive of course, my sister is using what travel insurance she has but it is what it is.
Dad and I are going home as planned on Thursday. Someone has to go home - the pet sitter can't extend. And dad is sick and needs to go home to recover, so we are employing a polite fiction that we could only move 2 seats. My sister is staying and will come home with mom on Sunday. We hope that's enough time for mom to get the point where she can tolerate the lower oxygen on the plane.
Whatever charges there are, we can pay them. We checked prior to the trip and their medicare will cover 80%, so we'll have to jump through all the hoops for Medicare reimbursement.
I've also called in help from my friends. In particular, one of my friends is going to make 2 big batches of soup this weekend so that parents have good food readily available.