What is the ruling on limiting the inheritance to only the three daughters, while there are other heirs such as a husband, a brother from the father's side, and a full sister?

A deceased person's will stating that the inheritance should go to her three daughters is not enforceable unless the rest of the heirs agree to it. If the heirs do not consent to its execution, then it holds no weight.

If the deceased left no heirs other than the husband, her three daughters, a full sister, and a paternal half-brother, then the estate is divided as follows: - The husband receives one-fourth as a fixed share due to the presence of a descendant, based on Allah's saying: {But if they have a child, then for you is a fourth of what they leave} [Quran 4:12]. - The daughters receive two-thirds as a fixed share, based on Allah's saying: {But if there are [only] daughters, two or more, for them is two thirds of what she left} [Quran 4:11]. - The remainder goes to the full sister by way of ta'sib (residuary heirship). - The paternal half-brother receives nothing because he is completely excluded by the full sister.

The estate is divided into thirty-six shares: - For the husband: nine shares (one-fourth). - For the daughters: twenty-four shares (two-thirds), with each daughter receiving eight shares. - For the full sister: three shares (the remainder).