So sorry to hear, Drummer. Some advice I can give you is to make peace (say all that needs to be said) earlier rather than later so you can spend the rest of your time loving your Dad and supporting your family. Sometimes you just run out of time and you miss your spots to make sure the people you love know that you mean it and hear you say it. Have a sense of humour about difficult things at the same time that you allow your father the dignity of grieving the losses he will experience along the way. Acceptance is the key to getting through this.