Permissibility of bequeathing up to one third of the inheritance to the sons

Q: My son died and left a wife and five children. I want to give them their father's share of inheritance along with their four uncles and two aunts in my will. I hope to get your reply as to whether this is permissible.

A: It is permissible to bequeath one-third of your property or less to the sons of your dead son, for they are not legitimate heirs. May Allah grant us success. May peace and blessings be upon our Prophet, his family and Companions.