I am so sorry to hear about your father's health. My heart goes out to you, being so far from family. Communication with your father and your family will help you feel as if you're closer.
I can relate. I'm here in Oregon, and my family is mostly in Alberta. My dad is in his late 70's, my stepmom in her late 60's and they are mostly healthy so far. But I know they won't always be.
When my mom went through breast cancer and treatment, then to bone cancer, then to her organs, it was hard to be so far away and not able to get back home as often as I wanted to before she passed away (diagnosed in 1978, died in 1984). We spent lots of time on the phone, which helped. Cards and letters too.

Best wishes for you and your family. My thoughts and prayers are with you.
Edna