The difficulty of caring for an ill person, or the impact it has on the family, is one of those things that has to be felt to be believed. But remember this, when Allah wills good for someone, he either gives them knowledge or brings calamities on them. Often times we are so engrossed in the difficulty of the situation, in asking Allah for His aid, to hear our call, to heal us, we forget the value in the calamity He has placed on us - and that is His remembrance. He remembers us weak slaves, for He tests who He loves. May Allah restore your fathers health and make every moment forward an easy one, and provide for the deepest cries of your hearts, from unexpected means.