Ibrahim (Nakhai, may Allah have mercy on him) narrated: The wife of Abdullah (may Allah be pleased with him) came to the Messenger of Allah (peace and blessings be upon him) and said: The nephews of mine or of Abdullah (may Allah be pleased with her) are under my care; can I spend my zakat on them from my wealth? The Prophet (peace and blessings be upon him) said: "Yes."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الزكوٰة / 296