Sayyiduna Abu Mas'ud al-Ansari (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "Indeed, when a Muslim spends something on his family while hoping for its reward from Allah, it is a charity for him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7756