What is the ruling on disposing of the mother's inheritance if it is mixed with unlawful money, while there are needy heirs, and is zakat obligatory on this money while it is under the disposal of one of the heirs?

The heirs must calculate the ill-gotten wealth and donate it as charity to alleviate the burden on the mother. If the owner of the money taken without his consent is known, it must be returned to him. If he is not known, or if the money was taken in exchange for an unlawful benefit, then it must be disposed of by spending it on the interests of Muslims or giving it to the poor. It is not permissible to benefit from it. Brothers in dire need are permitted to benefit from the second type of ill-gotten wealth, as it is one of its legitimate disbursements, though refraining from it is better for them. As for the lawful wealth, it is to be divided as a legal inheritance, and Zakat is obligatory on each heir's share that reaches the nisab from the day of the mother's death. The adult pays it for himself, and the guardian pays it on behalf of the minor.