First of all, after the death of the second daughter, the marriage relationship with the son-in-law is automatically dissolved, and the second son-in-law has no right to inherit. Only the son (grandson) of the second daughter has the right to inherit the grandmother's inheritance on behalf of the mother, which is legally called subrogation inheritance. The death compensation of 654.38+ 10,000 yuan should include the alimony paid by the second daughter to her parents, which can be claimed according to law. The old mother's inheritance is divided as follows: the old mother and father each own 50% of the husband and wife's property, while the father is alive, 50% of the husband and wife's property, and the other 50% belongs to the mother. Mothers' heirs include: father, eldest son, second daughter and youngest son. 50% of the mother's inheritance is divided equally by four people, and each person gets 12.5%, that is, the grandson.
The son can get 12.5% of the inheritance. The father owns 50%+ 12.5% of all assets.