Ref. No. 1246 Alif
In the name of Allah the most Gracious the most Merciful
Please find below the answer to your question:
When the father is alive, he is the owner of all his properties. Children shall have no share in the property of their father in his lifetime. After father's death, the heirs will own all his properties. The children die in the lifetime of their father shall have no share in his property. The heirs are those who were alive at the time of their father's death, and they will have share in the property of their deceased father.
In the above mentioned case, when the Khalu was not alive at the time of his father's death, he shall have no share in his property.
And Allah knows best
Darul Uloom waqf Deoband