Dad is not in a good condition

So, my dad was diagnosed with early onset Alzheimer's and has been dealing with it for about 7 years now. It's an very rare case because he is only in his mid 50s.

Anywho I live in another country and have during the whole course of his Alzheimer's. When he had home care I helped my family paying for that by splitting the cost 50/50 with my mother. I come home to visit once or twice a year because it's a really long and expensive trip. My dad has recently reached stage 7a of his Alzheimer's and if you know then it's not good. It's basically the last stages. He had a seizure the other day and has been in the hospital since then. His condition is not looking good. I decided to fly in to see him and spend time with family. I think this is the time where I have to say goodbye. I have been grieving him for the past 2-3 years or so after seeing how much he has changed over time so I am at peace with the what the possible outcome could be. Don't get me wrong, when the time comes I will be devestated of course, but I've accepted what's to come.

Next, my job has been pretty understanding in me flying out to be here. However, I know I have a timeline for how long I can stay during this trip. My visa is set to expire soon so I know I'll have to return to sort all of that out. My life, career, friends and dreams are all here in my current country abroad . As, I've been living and working here for the past 7 years.

Maybe I'll have to leave before my dad is stable or before he passes... Maybe I'll have to leave before some people think that I should. I know I took this trip for ME. I wanted to see my dad and say my goodbyes. But I guess I wonder how can I explain to others or to family so they'll understand my situation? Anybody dealt with something like this?

Also having to fly back to attend a funeral should that be the case is not a problem! I'll make it happen of course!