This is natural and expected at the end of all life, so in everything you do, try to show them that this isn't a shock, that you will all live through this, that your father's memory will live on, and to "remember the good times". Be happy in the time you are with him, smile a lot, try to seem at peace so that both your father and the kids can be at peace. When your father is towards the end, be sure to tell him that it's okay to go, when he wants to, that you will all be fine, and everything's "set". Don't let him think he's got unfinished business so he'll suffer along thinking he's got stuff to do. When he's tired, he needs to just leave. Fighting to stay alive is hard work when all else has failed. I just went through this with my Aunt, and it was difficult, in a hospice, she lingered for over a week semi-conscious. Remember, even at the end, even when they can't move or talk or even blink an eye, that they CAN hear you. Always talk TO your Dad when in his presence, don't talk to others in the room with him like he's not there, even if he's quiet. (they taught me this at the hospice, that it confuses people who are laying there, when they can hear a conversation taking place but it's not for them, makes them try to fight to get up to converse). Getting back to the kids though, they have to know that crying is okay and normal, losing someone you love is terribly sad, but is a normal life thing. There is nothing to fear, you don't want them to be afraid of death, which will ultimately claim us all! You will be strong and hold hands and be there together to enjoy the time with your father while you still can, and he will live in each of your hearts and souls, so he'll never REALLY be gone, you just won't SEE him anymore. Good luck to you, it's a horrible time to lose a parent (I already lost both my older sister AND my father, so I do know the gaping hole in your life!!!) but you know he wants you to enjoy your life and keep doing what it is you do to enjoy yourself and enrich your children's lives.... best wishes to you....