If child dies before father, the grandchildren do not become inheritors

Question

We were five brothers and three sisters. Two of my brothers died while my father was still alive. Now that my father has passed away, his legal heirs are 3 brothers, 3 sisters and my mother. I would like to know whether the children of my late brothers have a right to share in my father's property?

Answer

One of the reasons someone inherits is that he is alive when the owner of the estate dies. If the brothers and sisters were alive when the owner of the estate died, then their children deserve their fathers’ or mothers’ shares if they have yet to be distributed. 

The reason for this is that these children would be the inheritors of their parents and accordingly they have the right to receive their share. 

However, if any of the estate owner's sons and daughters die before he does, then their children have no right to receive any share in the estate after the death of the owner of the estate. 

Some scholars have said: In such a case, the father may prepare a will in which he may assign the share of his deceased son or daughter to their inheritors. This is only applied in the Egyptian courts. 

And Allah knows best.

-islamtoday.net