Is it permissible to purchase a house and register it in the mother's name, while writing a will stipulating that it becomes an endowment (waqf) for the daughter after the mother's death, or a gift to her, to ensure that the father does not share in it after the mother's death?

A bequest to an heir is not permissible. If a person makes a bequest to an heir, it is not enforceable unless the rest of the heirs consent to it.

If an endowment to an heir is conditional upon death, it is considered a bequest and will not be executed without the consent of the heirs. However, if the endowment is immediate (effective during the endower's lifetime) and made while the endower is in good health, then it is valid.

If a father refuses to provide for his daughter, her case may be brought before the Sharia court to compel him to do so.