What is the share of the deceased's children from their grandfather's inheritance?

If the deceased has no wife or mother, the inheritance is divided as follows: the father receives one-sixth as a fixed share (fard), and the remainder goes to the children, with the male receiving the share of two females. The siblings of the deceased receive nothing because they are excluded by the father. As for the share of the deceased brother's children from their father's inheritance, they receive nothing because they are excluded by the son. It is recommended to bequeath to them something not exceeding one-third.