Your grandfather assets will devolve on your father as he is a class 1 legal heir. Grandson is excluded when son is living
The father's assets will devolve on his mother (your grandmother, if she is living), widow and children
The children include both from first and second wife
However this is assuming that your father has not transferred his assets during his lifetime or made a Will for the same
You have a right in father's assets only if he dies intestate
The father's assets would also include the property which he inherited from your grandfather
The answer is given on assumption that only self acquired property is involved and there is no ancestral property