There isn't an easy answer to this question since it's terms are so narrow and vague. As dzug has alluded to, we need to know more about the value of the estate - heritable (land/buildings) and moveable property (cars, shares, savings, etc.) - and any debts that may be attached to those different types of property. We also need to know if a will has been made.
In the broadest terms, it is not possible to disinherit one's children - even if the terms of your will (self written, perhaps) contradicts this legal position. However, and again in broad terms, if the estate is meagre, the children will likely see nothing; perhaps a small amount may be inherited if the estate is modest; and, if the deceased's estate is very large, then there is a good chance that any surviving children would inherit a substantial amount.
I will try and give you some examples as a guide.