Is it permissible to take from the Zakat money, which I was entrusted to distribute, to meet a personal need without the knowledge of the one who entrusted me?

If the father specified a particular recipient for the zakat, then the son taking from it is considered a betrayal of trust (amanah), and he must repent, return the money, and disburse it according to the specified zakat channels. However, if the father did not specify a particular recipient and the son is one of those eligible for zakat, then it is permissible for him to take from it for his need to marry in a customary manner and without extravagance. The father is not obligated to marry off his poor son.