I was saddened to hear the sudden demise of your father. It seems unfair that his illness was properly diagnosed only three months ago and he is already gone.
He has been inspiration to all of us. He held his courage till last minute and fought with disease. He was a strong man and lived his life with dignity. Even in his death he leaves us with inspiration to fight till last. It might not be possible to replace the void caused due to his death in your life but it only seems sensible to move on in life. Be strong in this moment of grief.
We pray that heavens be granted to him and gods bless him in his death.