God has no Grandchildren 

After that whole generation had been gathered to their ancestors, another generation grew up who knew neither the LORD nor what he had done for Israel. (Jdg 2:10)
 
Every person must receive Christ through faith for themselves.   
It is the task of the present generation to preach the gospel to the next, in order that they too might live in the fulness of all that Father God wants to give His children.