Sayyidah Fatimah al-Kubra (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) said: "The children of every woman have a paternal kinsman ('asabah) to whom they are ascribed, except for the children of Fatimah, for I am their guardian and I am their 'asabah."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19245