The ruling on depriving one of the sons of inheritance by bequest

Question:
A father who has wealth and six children made a bequest before his death that the partnership be divided among five of the sons, excluding one. Does the son whom the father bequeathed to be excluded receive from the inheritance?

Answer:
This bequest is invalid: to deprive some of his children of inheritance. We ask Allah for well-being. This is not permissible, except if this son differs from him in religion. If he differs from him in religion, there is no mutual inheritance between those who differ in religion. As long as he is a Muslim, it is not permissible for him to deprive him of his right to inheritance. Yes.