It is narrated from Sayyiduna Salman bin Amir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Your charity to a poor person is simply charity, but charity to a relative carries a double reward: that of charity and that of joining the ties of kinship."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13222