Is spending on one's family and sisters to prepare them for marriage considered zakat, or is it a duty that also necessitates giving out zakat on one's wealth?

The preponderant view among scholars is that it is permissible to give zakat to any relative who is eligible to receive it, with the exception of parents and children. A condition for this is that the intention of the zakat payer to give zakat must be present at the time of its disbursement. Therefore, it is not permissible to count what was spent previously with the intention of general expenditure as zakat.