KSI Family Tree: The Story Behind The British YouTuber Empire

Olajide Olayinka Williams "JJ" Olatunji, known as KSI, born 19 June 1993 in Watford, Hertfordshire, England, is a British YouTuber, rapper, boxer, and entrepreneur — co-founder of Sidemen (UK YouTube collective); co-founder of Prime Hydration with Logan Paul (2022, $1+ billion in sales by 2024); pro boxer (defeated Logan Paul rematch 2019; Jake Paul fight controversial draw 2023).

The Family's Roots: A Nigerian-British Family

The Olatunji family is Nigerian-British — parents emigrated to the UK from Nigeria.

His Parents

Father: Jide Olatunji Sr. — Nigerian-British father.

Mother: Yinka Olatunji — Nigerian-British mother.

His Brother

Deji Olatunji, born 9 December 1996 — KSI's younger brother; YouTuber (ComedyShortsGamer, since rebranded); 10+ million subscribers; pro boxer.

His Personal Life

KSI is in a publicly-acknowledged relationship with Hannah West (since 2016, intermittent); they have not married.

The Olatunji Family Tree at a Glance

Family Origins: Nigerian-British; Watford, Hertfordshire.

Father: Jide Olatunji Sr. — Nigerian-British.

Mother: Yinka Olatunji.

Brother: Deji Olatunji (b. 9 December 1996) — YouTuber; pro boxer.

Partner: Hannah West (since 2016).

KSI:

  • Born 19 June 1993, Watford
  • Berkhamsted School
  • Started YouTube channel KSIOlajidebt in 2009 (age 15) — FIFA gameplay
  • One of the original founders of Sidemen (2013): with Miniminter, Zerkaa, Tobi, Vikkstar, Behzinga, W2S — UK YouTube collective with 20+ million subscribers
  • 25+ million subscribers across his main YouTube channels
  • Music: 5+ studio albums; Dissimulation (2020 — debut at #2 UK Albums Chart); All Over the Place (2021 — #1 UK Albums Chart)
  • Boxing: defeated Joe Weller (2018), drew with Logan Paul (2018), defeated Logan Paul rematch (2019), defeated Swarmz, Luis Pineda, FaZe Temperrr (2022), defeated Joe Fournier (2023), drew with Tommy Fury (2023, controversial)
  • Prime Hydration: co-founded with Logan Paul (March 2022) — sales of $1.2+ billion in 2024
  • XIX Vodka: co-founded 2024
  • 100+ million followers across all platforms

What the Olatunji Family Story Teaches Us

A Nigerian-British family in Watford. A younger brother who is also a YouTuber and pro boxer. A long-term partner. A career that combined YouTube, music, boxing, and a $1+ billion beverage brand.

For every family — large or small, famous or otherwise — the KSI story carries the same lesson. Some families produce two pro-streamer-boxer brothers. The Olatunji brothers (KSI and Deji) are both YouTubers and pro boxers — and have publicly fought each other for years before reconciling.

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