I cannot say that I completely understand your unique personal feelings because we are individual in how we feel, think and believe, but I do understand the strength of reaction you can have to this sad, sad time. I too, have lost those special beings who I thought would always be there. 

Children need particular consideration and ways of explaining because they can react differently from adults.

In this section there are links to helpful literature, grief counselling and other forms of help: I have deliberately left much that I could write out, because these link you to  advice and help from experts with far greater experience and abilities in this field than my own.