WieWaldi I'm sorry to hear about your father, I've been in that position and I remember how hard it was. When a parent is ill our roles suddenly reverse and we become the ones caring for them - it's hard to cope with and can be all consuming. Don't forget to take care of yourself too - you need to stay strong. The piano can wait, you have other priorities right now.
"Don't let's ask for the moon, we have the stars." (Final line from Now,Voyager, 1942)