Sayyiduna Umar (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "For all the children of a daughter, their agnatic kin ('asabah) are through their father, except the children of Fatimah, for I am their 'asabah and I am their father."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2618