Life is indeed unexpected. We never know when that moment will come and it's also true that we all will pass through that last event of our life. That's what life is, if birth is true, then death is inevitable.
Please accept my deepest condolences and may God give you and your family the courage to bear this loss.
We all know the ultimate truth, but it's hard to feel the pinch, when it comes to you.
Sometimes it is difficult to accept even if a conceivable truth. The point is our emotional and deep attachment to our nearest and dearest ones. We can not simply accept their departure. I can feel your emotion at the moment.