Is it permissible to give 20% of the Zakat for eight years to a nephew to help him get married without informing him?

It is permissible to give Zakat to a nephew if he is in need of marriage, and this is preferable because he is a relative. He does not need to be informed that it is Zakat. The giving should be according to his need, without extravagance in non-essentials. As for prepaying Zakat for eight years, there is a difference of opinion among scholars; the more correct view is the permissibility of prepayment, but the period should not exceed two years.