From Sahih Bukhari (Hadith 4664):
Narrated Ibn Abi Mulaika:When there happened the disagreement between Ibn Az-Zubair and Ibn `Abbas, I said (to the latter), "(Why don't you take the oath of allegiance to him as) his father is Az-Zubair, and his mother is Asma,' and his aunt is `Aisha, and his maternal grandfather is Abu Bakr, and his grandmother is Safiya?
Reference: Bukhari 4664