Babatunde Raji Fashola (SAN) is a descendant of the patriarch of the Fashola family, Alfa Bello Fashola of Princess Street in Isale Gangan, Lagos. On the Fashola family tree, he is the great-great grandson of Bello Fashola, a philanthropist and a very close friend of Esugbayi Eleko, who contributed morally and financially to the struggle to return Esugbayi Eleko to Lagos after the Oba's banishment from his kingdom by the then colonial government. Bello Fashola had 137 children with Tiamiyu Bashorun Fashola as the eldest child. The direct linkage is as follows: Bello Fashola begat Tiamiyu Fashola, who begat Raji Olayinka Fashola, who begat Ademola Fashola who begat Babatunde Raji Fashola.
He is also linked to Isale Eko through his paternal grandmother who is a direct descendant of the Shomade/Bashua family of Obun Eko and Suenu chieftaincy family house. His paternal great, great grandmother was Jarinatu Okunnu from Isale Eko Onilegbe family whilst his maternal great grandmother is from Idumagbo Isale Eko of the Suenu Chieftaincy family.