What would you do if a relative's SO was very sick?

If your relationship with the relative is cordial, you see each other a few times a year at family things, and talk maybe twice a year otherwise, but you had a falling out in the past. It’s not a sister or a parent, think more along the lines of inlaws or cousin.

Her SO is terminal I think, but I don’t know how much time the doctors predict he will have. I’m hoping I’m wrong, and he has a chance of getting better.

Would you call the relative every so often? Text? Ask questions?

They live about 3 hours away, would you offer to help, and mean it? Drive down for treatments or surgeries?

If you were the relative with the sick SO, what would you want people to do for you?

She has her adult children and parents very close by, so she is not alone.