Is it permissible to purchase necessities for a jailed brother from zakat funds, knowing that money cannot be delivered to him in cash?

If the brother is poor, it is permissible to buy his necessities from zakat, especially if it is difficult to deliver the money in cash. Some scholars permit giving the value of zakat for a benefit, and some allow giving zakat with anything that is permissible to donate. If he is not poor, it is not permissible to give him zakat; rather, he should spend on himself from his own money.