It is narrated from Sayyiduna Salman bin Amir al-Dabbi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Your charity to the poor is charity, and your charity to a relative is two charities: one charity and one act of maintaining family ties."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6181