First of all, the testament has priority. Only when there is no will, the following rules of statutory succession are followed: 1. The first successor is the spouse, children and parents. If your grandmother's spouse and parents have passed away, then they are the eldest and the third. Where there is a first ranking heir, the first ranking heir shall share the estate equally. 2. If a child of the decedent dies earlier than the decedent, the child of the child can inherit in subrogation, that is, inherit the estate in place of his or her parents. Therefore, the children of the second child who has passed away have the right of inheritance and can share equally the share of the second child. In other words, if only legal inheritance is considered, your grandmother has only three sons, and both parents and spouse have passed away, then the eldest child and the third child each get one third, and all children of the second child equally share one third of the second child's share. Of course, this is a legal requirement, which can be settled through negotiation by one's own family. As long as the consensus is reached, there is no problem in principle.