What is the ruling on bequeathing to a grandson and a non-relative?

Question:
A woman has two sons, and her property consists of a house. She stipulated that if the younger son dies, his son should take his place as an heir?

Answer:
If she bequeaths to them, there is nothing wrong with it, up to the amount of one-third. They are entitled to no more than one-third, unless the rest of the heirs consent.
Q: Are the two sons partners in the house after inheriting from their mother?
A: The point is that if she bequeaths to her son's children, the bequest is valid and there is nothing wrong with it, but it must be one-third or less.
Q: She bequeathed to one of them...?
A: Or to a non-relative, it must be one-third or less.
Q: She bequeathed to the sons of one of the two sons. Is that permissible?
A: One-third or less; because they do not inherit. The son alongside the son is their paternal uncle, which prevents them from inheriting. They are not heirs. So if she bequeaths to them one-third or less, such as a quarter or a fifth, there is nothing wrong with it.
Q: The bequeather, even if his wealth is small?
A: Even if his wealth is small, if he bequeaths.